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Hickok 1890M In-circuit transistor tester

1. un un um un un UN an un un un Vn n un un Vn un n nU Vn UD UU un US wn un un UN UN 9 9 9 9 9 9 95 9 9 9 9 9 5 49 4 9 4 9 8 9 9 9 8 95 4 9 9 8 9 95 9 9 9 9 6 9 9 9 9 9 4 9 9 9 9 9 uo 9961 Tidy T padueyo 198 6 d MEL critica rm Na 2N232 2N233 2N233A 2N238 2N240 2N241 2N241A 2N242 2N243 2N244 2N247 2N248 2N265 2N269 2N274 2N279 2N280 2N281 2N282 2N283 2N284 2N284A 2N292 2N293 2N299 2N300 2N306 2N311 2N312 2N315 qf ae a to P D Bree ce cnc O O O1 On Y ON ON Q Qi Q O Q O Q Gi Qn ON Q O O1 cocco 20 30 30 47 70 with Beta matched to within 30 40 T 5 Om O gt NN 0 5 0 bi MIN pee go D o ps 5 air of 2N 47 47 25 25 11 18 18 16 75 50 50 25 cc D D D O O 000 on en oe PD ja 1 905 1 5 OL 9961 T padueyo 95 2N232 2N233 2N233A 2N238 2N240 2N241 2N241A 2N242 2N243 2N244 2N247 2N248 2N265 2N269 2N274 2N279 2N280 2N281 2N282 2N283 2N284 2N284A 2N292 2N293 2N299 2N300 2N306 2N311 2N312 2N315 40 30 70 70 55 15 40 55 20 110 24 60 20 30 30 47 70 with Beta matched to within 30 FPS g p
2. nun t ue 9 n w lt 260555655595 632 sosie sole ala ela 8 Zero in this column indicates an original page A Change 12 T O 33A1 3 206 1 Table of Contents List of Hlustrations TABLE OF CONTENTS Section Page Section Page E I USE AND MAINTENANCE 1 47 Troubleshooting 18 4 Introduction 5 6 9 res 1 49 Disassembly 18 m 5 Description 1 51 Repair or Replacement 21 21 Preparation for Use 9 52 Calbration ccc 569555 259 21 22 Operating Instructions 9 61A Transistor Reference Chart 26A B E 36 Tester Limitations 20 I PARTS BREAKDOWN 27 43 Maintenance Instructions 18 62 Introduction ss gs Skea ss 27 45 Cleaning 18 65 Vendor s Code DARE 46 Inspection 18 67 Reference Designations 27 LIST OF ILLUSTRATIONS 3 Figure Page Figure Page 1 In Circuit Type Transistor Tester 2 19 Table of Audio Oscillator Circuit s 23 Model 1890M Voltage and Resistance Values 5 2 Tester Schematic Wiring Diagram 3 2 Table of A C Amplifier Circuit S 23 3 IcBO Test Circuit o sw 6 Voltage and Resistance Values A 4 Ic Test Circuit 6 Teia 6 21 Calibration Test Equipment 24 5 Z Ohms Test Circuit 7 22 Voltmet
3. UU n Un UT UN un 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 1 4 4 4 1 1 4 3 1 1 4 1 4 4 4 4 4 4 4 1 1 4 4 4 4 4 4 4 4 4 4 1 1 1 1 de 4 4 4 4 4 4 4 4 4 4 4 9 0 9 9 9 9 94 Changed 13 June 1969 26G Transistor Type 2N448 2N449 2N450 2N460 2N461 2N464 2N465 2N466 2N467 2N470 2N471A 2N471 2N472A 2N472 2N473 2N474A 2N474 2N475A 2N475 2N476 2N477 2N478 2N479A 2N479 2N4BOA 2N480 2N481 2N482 2N483 2N4B4 2N485 2N486 2N495 2N496 2N497 A 2N498 A 2N499 2 501 2N502A 2N502 2N503 2N504 2N508A 2N508 2N509 2N515 2N516 2N517 2N518 2N519 A 2N5204 2N520 2N521 2N5214 2N522 2N5224 2N523 2N52 4 2N52 2N525 2N526 A 2N527 4 2N534 2N535 A 8 2N536 2N537 2N538 A 2N541 T O 33A1 3 206 1 003 ONA 000 2 003 0NA 000 2 000 2 150 0NA 150 0NA 006 0 006 0 006 0 006 0 006 0 006 0 000 4 060 0NA 004 0 004 0 005 0 005 0 003 0 003 0 003 0 006 0 003 0 003 0 002 5 002 0 002 0 002 0 004 0 002 0 002 0 002 0 002 0 002 0 002 C 002 0 002 0 002 0 004 0 004 0 004 0 004 0 005 0 006 0 006 0 ERE HHH HH HH HHH HSH HHH EHR ER ER Em VA MS UU UN wn un Un
4. 34 5 d EN ST 5 T O 33A1 3 206 1 Section II Parts Breakdown DESCRIPTION 234567 TERMINAL BOARD ASSEMBLY TB2 Cont RC20GF102K RESISTOR FIXED COMPOSITION 1 K ohms 10 1 2 w MIL R 11 NLW 30 25 CAPACITOR FIXED ELECTROLYTIC 30 uf 25 v Mfd by 88419 2N651A TRANSISTOR M d by 04713 T CPO5AIEE103K COE 4003 FIXED PAPER DIELECTRIC 0 01 uf c 10 400 v RC20GF913J RESISTOR FIXED COMPOSITION 91 K ohms 5 1 2w MIL R 11 JAN IN198 SEMICONDUCTOR DEVICE DIODE Germanium RC20GF103K RESISTOR FIXED COMPOSITION 10 K ohms 10 1 2 w MIL R 11 RC20GF223K RESISTOR FIXED COMPOSITION 22 K ohms 10 1 2 w MIL R 11 RC20GF150K RESISTOR FIXED COMPOSITION 15 ohms 10 1 2w MIL R 11 RC20GF103K RESISTOR FIXED COMPOSITION 10 K ohms 10 1 2 w MIL R 11 2420 502 BOARD Terminal staked 4 ses e e e Figure 29 Terminal Board Assembly TB1 FIG amp PART QTY USABLE INDEX NO DESCRIPTION PER ON NO 1234567 ASSY CODE TERMINAL BOARD ASSEMBLY TB1 2420 505 TERMINAL BOARD ASSEMBLY See item 18 figure 26 for next higher assembly CPO5AIEB474K CAPACITOR FIXED PAPER DIELECTRIC 0 47 uf 10 100 v MIL C 25 RC20GF101K RESISTOR FIXED COMPOSITION 100 ohms 10 1 2 w MIL R 11 2N650A TRANSISTOR Mfd by 04713 RC20GF913J RESISTOR FIXED COMPOSITION 91 K ohms 59 1 2 w MIL R 11
5. EE ee pet f be ok WV g c 9 T 902 TYEE OL VV9Z 96 z qur o q CT pasuryo 2N912 2N914 2N915 2N916 2N917 2N918 2N919 2N920 2N921 2N922 2N923 2N924 2N925 2N926 2N927 2N928 2N929 2N929A 2N930 2N930A 2N935 2N936 2N937 2N938 2N939 2N940 2N941 2N942 2N943 4 4 4 1 1 1 1 kE 1 1 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 pe ER DE SE E S000000000000000000 T 903 TVE OIL P96T 1equie2eq GT paduryo AVZ e ve So G2 WES 9 Sa Go oso won 01 o ANA o o Y ON Y ON Y ON Y UM o ON ON ON T 902 e 1V 6 OL ovoz 961 19quie eq GT pasueyo 2N978 2N979 2N982 2N983 2N984 2N985 2N987 2N990 2N991 2N992 2N993 2N995 2N996 2N1000 2N1008 2N1008A 2N1008B 2N1010 2N1012 2N1017 2N1021 2N1022 2N1023 2N1024 2N1025 2N1026 2N1026A 2N1027 2N1028 3 3 3 3 5 3 8 8 8 8 8 3 3 5 6 4 4 7 5 0 I ER n o Som amp d ph ge ON pM SE JJ Jr DE TAN SP Cc O1 a Oi A Oi ON c ou c oc o go ON ON a ON o o A oi ci n On H Leads B L
6. REFERENCE FIGURE amp DESIGNATION INDEX NO PART NUMBER P1 26 12 M1 14M lo BT1 33 4 763 Q1 32 4 2N651A BT2 33 9 2370ST Q2 32 4 2N651A 5 3 33 9 23708 Q3 29 3 2N650A CRI 26 9 8991 94 29 6 2N651A CR2 28 1 IN91 Q5 28 5 2N651A CR3 28 8 JAN IN198 RI 32 13 RC20GF221K CR4 28 8 JAN IN198 R2 32 12 RC20GF183K CR5 28 8 JAN IN198 R3 32 3 RC20GF392K CR6 28 8 JAN IN198 R4 32 5 RC20GF103K i 1 32 2 MQZFP 5 1M 10 R5 32 11 RC20GF101K c2 32 7 MQZFP 5 2M 10 R6 32 10 RC20GF393K T C3 32 6 CPOSA1EB224K R7 32 5 RC20GF103K 4 32 8 CPO5A1EB104K R8 26 29 16925 391 ix C5A 30 4 TE1162 R9 26 25 16925 393 C5B 30 4 TE1162 R10 26 27 16925 391 C6 26 41 BSX 5100 R11 26 25 16925 393 29 1 CPO5A1EC474K R12 30 3 RN70B49R9F C8 29 9 NLW25 25 R13 31 5 RC20GF471K C9 29 8 CP05A1EB224K R14 27 6 RC32GF4R7K C10 29 10 CP05A1EC473K R15 27 7 RC20GF470K Cll 28 6 CPO5A1EE103K R16 27 8 RC20GF471K E C12 28 4 NLW 30 25 R17 21 9 RC20GF472K El 26 4 DF31BLC R18 31 1 RB55AE1R000F Ser REFERENCE DESIGNA TION P19 R20 R21 R22 R23 R24 R25 R26 FIGURE amp INDEX NO 31 3 31 2 21 5 27 4 31 6 26 22 31 4 21 2 30 1 30 2 30 1 30 2 31 1 21 3 26 19 29 5 29 2 29 12 29 4 29 7 T O 33A1 3 206 1 PART NUMBER RB55AE10R05F RB55AE105R3F RB55AE222R2F RB55AE20R20F RC20GF472K RV4NAYSD251A RC20GF332K RN70B4993F RN70B1001F RB55AE10R00F RN70B1001F RB55AE10R00F RB55AE1R000F RN70B2003F 20 9316 RC20GF183K
7. Ch EN t Ct Cn EN EN IND A f fot ES S000000O000000000 0 o 1 08 8 OIL 2N780 2N781 2N782 2N783 2N784 2N784A 2N789 2N790 2N791 2N792 2N793 2N794 2N795 2N796 2N797 2N799 2N799A B 2N800 2N801 2N802 2N803 2N804 2N805 2N806 2N807 2N808 96 19qQUIIDJIA GI POSUEUD x9z co co co o aJ Se ph peg d Ps e GS GS I I I Ia P re en woooogogoogugogoooomusogooocococoocg co al wi ok 9 a bo T ML O EUER HR E T 90 TYEE O L F96T 19QuI323 GT pesueyD A9 OO CC WWW AA AIA OT OT CO CO CO D C5 C5 C5 C5 bo N OUO Q O1 O1 01 A Q ON On On ON ON Q Q ON ON ON On ON ON Q Y Q A Q 01 ON ON 4 4 4 4 4 4 4 E 4 4 4 4 4 4 Le 4 1 1 1 1 1 4 4 4 4 4 4 4 1 ud 1 905 1 8 O L 295 oem 2N846A B 2N849 2N850 2N851 2N852 2N858 2N859 2N860 2N861 2N862 2N863 2N864 2N865 2N869 2N870 2N871 2N902 2N903 2N904 2N905 2N906 2N907 2N908 2N909 2N910 2N911 Cc O1 ON On On On ON Y ON ON ON ON a ON ON c ci o i ON ON a oc vi bent DO e Oc OoOo P96T 1equieoeq GI 98959 000000000000 0200000000 BB PPP APP SPP PP
8. GVL20108 GVL20114 DS 100446 Controlled Rectifier cannot be tested DS 100023 Diode Testing See instruction book page 16 and 17 1 05 1 8 FOL NV9G PIGT 19quie2eq sI po3uey 2N1573 2N1479 2N1480 2N1481 2N1482 2N1491 2N1492 2N1493 2N1494 2N1499A 2N1500 2N1507 2N1510 2N1515 2N1516 2N1517 2N1524 2N1525 2N1526 2N1527 2N1528 2N1564 2N1565 2N1566 2N1566A 2N1572 proa a q 4 4 4 1 4 4 1 4 4 4 4 4 4 4 4 4 4 4 4 4 4 PM 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 A ux on dde OR ET DS CON S00000000000000 ma fu 1 902 6 1TV66 OL a y T O 33A1 3 206 1 SECTION PARTS BREAKDOWN 62 INTRODUCTION 63 SCOPE a This section contains parts lists and illustrations figures 25 through 33 which are used to identify and describe parts of the tester to facilitate ordering re placement parts Vendor information and reference designations are also included in this section 64 ORDERING REPLACEMENT PARTS A re placement part is ordered as follows a Locate the part on the figure and determine the index number b Locate the index number found in the first col umn on the parts list pertaining to that figure Then determine the complete description and part number of the part for ordering 65 VENDOR S CODE 66 PURPOSE AND USE a The vendor s code is used to facilitate o
9. Icer test Short emitter and base binding posts and test as for Icbo Remove jumper for ta test d Note6 Indicated value for Icbo is typical not maximum Note 7 Set Collector Volts Vcb to 1 5 Note8 Set Collector Volts Vcb to 3 0 Note 9 No Beta condition listed on Changed 30 October 1969 26 Section I Transistor Type 2N29 2N34 2N35 2N43 2N43A 9N44 A 2N45 2N47 2N49 2N59 2N59A Bal 2N60 A H C 2N615 A B4C 2N63 2N64 2N65 2N68 2N76 2N77 2N78 4 2N81 2N94 A 2N95 2N97 4 2N9B A 2N99 2N101 2N102 2N104 2N105 2N106 2N107 2N109 2N111 2N112 2N113 2N114 2N117 2N118 2N118A 2N119 2N120 2N123 2N125 2N126 2N128 2N129 2N1304A 2N131 A 2N1324A 2N133 2N135 2N136 2N137 2N138 2N139 2N140 2N141 2N142 2N143 2N144 2N145 2N146 2N147 2N156 2N158 2N158A T O 33A1 3 206 1 005 0 016 0 016 0 005 0 005 0 005 0 005 0 003 0 003 0 007 0 007 0 007 0 007 0 006 0 006 0 006 0 002 5MA 010 0 006 0 001 5 006 0 014 0 002 5MA 002 0 010 0 010 0 002 5MA 002 SMA 006 0 003 0 012 0 006 0 006 0 001 0 001 0 001 0 001 0 000 8 000 8 000 8 000 8 000 8 003 0 002 0 002 0 203 0 003 0 006 0 006 0 006 0 012 0 005 0 005 0 005 0 006 0 004 0 004 0 002 0MA 002 0MA 002 0MA 002 0MA 003 0 003 0 003 0 400 0 300 0 250 0 26D Changed 13 June 1969 9 9 9 5 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9
10. 500 ohms of the Z OHMS CIRCUIT potentiometer as follows a Set the large knob the Z OHMS CIRCUIT po tentiometer to its minimum position b Place a 200 ohm 1 resistor between Binding Posts E and B using the test lead assembly 26 T O 33A1 3 206 1 c Place FUNCTION SELECTOR switch to Z OHMS CIRCUIT d Turn Battery switch to the right and increase the signal by turning BETA CAL potentiometer until the meter reads approximately 1 2 scale e Vary the small knob of the Z OHMS CIRCUIT potentiometer until null is indicated on the meter f Release the Battery switch Loosen set screw of small knob and set the indicator line of the knob to the 200 ohm point on the outer dial of the Z OHMS CIRCUIT potentiometer Thentighten the setscrew 60 KNOB OF RIN TRANSISTOR POTENTIOMETER R10 Calibrate the knob 100 ohms to 10K of the RIN TRANSISTOR potentiometer as follows a Place FUNCTION SELECTOR switch to RIN TRANSISTOR b Switch Z OHMS CIRCUIT potentiometer to OUT OF CIRCUIT position c Place a 1 1 resistor between the Binding Posts E and B using the test lead assembly d Turn Battery switch to the right and increase the signal by turning BETA CAL potentiometer until the meter reads approximately 1 2 scale e Vary the TRANSISTOR potentiometer until null is indicated on the meter f Release the Battery switch Loosen setscrews and set the indicator line of the knob to the 1K point on dial of
11. 83330 36 INSULATOR Mfd by 76549 L 34 CLIP Minigator Mfd by 76545 M f 4 3 1 1 1 1 1 1 a Im 30 i ENS Re T O 33A1 3 206 1 DESCRIPTION 1234567 PANEL AND CHASSIS ASSEMBLY No Number PANEL AND CHASSIS ASSEMBLY See item 2 figure 25 for next higher assembly 2420 516 TERMINAL BOARD ASSEMBLY See figure 27 for breakdown 19912 458 SWITCH ROTARY 1 section 4 position 3301 SOCKET TRANSISTOR mica filled beryllium copper silver pl contacts Mfd by 91662 DF31BLC POST BINDING blue Mfd by 12059 DF31GNC POST BINDING green Mfd by 12059 DF31YC POST BINDING yellow Mfd by 12059 10 LUG TERMINAL Mfd by 78189 2102 6HT E LUG TERMINAL M d by 78189 SD91 A SEMICONDUCTOR DEVICE DIODE Mfd by 81483 481 917 METER INDICATOR 50 ua 2K ohms 100uv Section II Parts Breakdown 31 Section II Parts Breakdown 32 19912 456 M1 14M 3825 334 2420 510 2420 506 19370 310 2660 905 2420 505 T O 33A1 3 206 1 USABLE DESCRIPTION ON 1234567 CODE PANEL AND CHASSIS ASSEMBLY Cont SWITCH ROTARY 3 section 3 position CONNECTOR RECEPTACLE ELECTRICAL Mfd by 97954 COVER Ampli e r i669 3G0 95 927 BOARD ASSEMBLY Component amplifier ICE TERMINAL BOARD ASSEMBLY See figure 28 for breakdown SPACER Terminal board BRACKET Terminal board S TERMINAL BOARD ASSEMBLY See figure 29
12. A 2N397 2N398 2N398A 2N402 2N403 2N404 A 2N405 2N406 2N407 2N408 2N409 2N410 2N411 2N412 2N413 2N413A 2N414 2N414A 2N416 2N417 2N422 2N425 2N426 2N427 2N428 2N438 PPP C5 C5 0 O O gt O gt 0 CO 00 CO I 3 m 00 gt pp 1 5 1 5 1 5 1 5 1 5 1 5 4 5 4 5 4 5 4 5 45 1 5 1 5 4 5 4 5 4 5 4 5 4 5 4 5 4 5 4 5 4 5 4 5 4 5 1 5 1 5 1 5 1 5 4 5 S000000 oooooooo ace ft PO PROF DO A n Q EN e oo EN 1 903 TVE O L N9c 961 Iaquisseq GI pagueyo 2N438A 2N439 2N439A 2N440 2N440A 2N444 2N444A 2N445 2N445A 2N446 2N446A 2N447 2N447A 2N448 2N449 2N450 2N460 2N461 2N464 2N465 2N466 2N467 2N470 2N471 2N471A 2N472 ec e 4 9 ww e e ww 3 W On O AAA ON O1 O1 aa On On YN YA YN ON ON ooo Y Y Q ON gt 3 3 3 gt 3 O O jh o ob uS I 5 HEA PP PPL Pee jh PP PPP r gt GR prod pet fo andl S0000000000000000000000000 Del He e I 902 TV OL PIGT 1equieoaq GT 58 59 097 2N473 2N474 2N474A 2N475 A 2N476 2N477 2N478 2N479 2N479A 2N 480 2N480A 2N481 2N482 2N483 2N484 2N485 2N486 2N495 2
13. Cn Ct Cn EN Ct Cn EN EN D NO 65 T 902 TV OL noz 06 Iequieoeq GT pesueyD 5 5 1 1 0 0 0 0 3 0 rd PS B co 99 4 is ge de Pb E e ea ae Ero prae prr pr m OT O1 O1 Qn Qn cn EN En Cn En Ct Ct Cn ON Ct EN EN TN Q t ON O Q t t O1 ET OI 0000000 T 903 TVE OL A96 P961 I9quiadaq GT p Suzuo Transistor Type Icbo Vce a KJENNE 2N731 2N734 2N735 2N735A 2N736 2N736A 2N736B 2N 138 2N739 2N739A 2N740 2N740A 2N741 2N742 2N743 2N744 2N745 2N746 2N747 2N748 2N749 2N750 2N751 2N752 2N753 2N754 e On On On On ON ON ON Y ON ON ON ON a ON ON ON ON Q a ogi c y 200000000000 S 000 2 m unn SO sis O O o e O1 OI ooo 4555555 as F umm ema AAA AS 1 902 TV E O L A96 POST 1equie2eq ST p Suzuo 2N755 2N756 2N756A 2N757 2N757A 2N758 2N758A 2N758B 2N759 2N759A 2N759B 2N760 2N760A 2N760B 2N761 2N762 2N768 2N769 2N770 2N771 2N772 2N773 2N774 2N775 2N776 2N777 2N778 2N779 2N779A B ecooopopooopewe rie me NL LL Se PP PH Hh OP gt t 2 P ad ai BBD RPR en cn Cn EN EN Ct EN EN En EN EN EN
14. Ic and turn Battery switch to the right energizing the tester e Adjust Ic potentiometer until the meter reads 0 1 MA Under this condition the meter is actually reading 1 MA f Turn FUNCTION SELECTOR switch to Z OHMS CIRCUIT and increase the amplitude of the audio os cilator by turning BETA CAL potentiometer until meter reads half scale Then vary the Z OHMS CIRCUIT potentiometers until null is obtained on the meter Read the value of external impedance from calibrated dial of the Z OHMS CIRCUIT po tentiometers If null occurs near zero or some low value the diode can be assumed to be shorted or leaky g Placethe FUNCTION SELECTOR switch to RIN TRANSISTOR and increase amplitude of the audio oscillator until meter reads half scale Then bal ance the bridge by varying RIN TRANSISTOR po tentiometer until null is indicated on the meter Read the value of the diode s dynamic forward re sistance from the dial of the RyN TRANSISTOR potentiometer Normal values of 50 500 ohms can be expected If a high value of resistance is ob tained the diode can be assumed to be open cir cuited or the external circuitry which shunts the diode is extremely low If the external circuitry is low adjust the IC potentiometer until the meter reads 2to 5 MA and then null the diode s dynamic resistance Variations in the dynamic forward re sistance of a diode is a function of the d c current flowing through the diode 30 OUT OF CIRCUIT DIODE
15. Section II Parts Breakdown RC20GF183K 2N651A RC20GF680K CPOSAIEB224K NLW25 25 CPOSAIEC473K RC20GF332K RC20GF150K 2420 504 T O 33A1 3 206 1 QTY USABLE DESCRIPTION PER ON 234567 ASSY CODE TERMINAL BOARD ASSEMBLY TBI Cont RESISTOR FIXED COMPOSITION 18 K ohms 10 1 2 w MIL R 11 TRANSISTOR Mfd by 04713 RESISTOR FIXED COMPOSITION 68 ohms 10 1 2w MIL R 11 CAPACITOR FIXED PAPER DIELECTRIC 0 22 uf 10 100 v MIL C 25 CAPACITOR FIXED ELECTROLYTIC 25 uf 25 v Mfd by 88419 CAPACITOR FIXED PAPER DIELECTRIC 0 047 uf 10 200 v MIL C 25 RESISTOR FIXED COMPOSITION 3 3 K ohms 10 1 2 w MIL R 11 RESISTOR FIXED COMPOSITION 15 ohms 10 1 2 w MIL R 11 BOARD Terminal staked Figure 30 Terminal Board Assembly TB5 FIG amp PART o NO DESCRIPTION PER x 1234567 CODE 2420 509 RN70B1001F RB55AE10R00F RN70B49R9F TE1162 2420 501 TERMINAL BOARD ASSEMBLY TB5 TERMINAL BOARD ASSEMBLY See item 31 figure 26 for next higher assembly RESISTOR FIXED FILM 1 K ohms 1 1 2w MIL R 10509 RESISTOR FIXED WIREWOUND 10 ohms 1 0 15 w MIL R 93 RESISTOR FIXED FILM 49 9 ohms 1 1 2w MIL R 10509 CAPACITOR FIXED ELECTROLYTIC 100 uf 15 w Mfd by 89307 BOARD TERMINAL Staked a lues ns 2420 508 RB55AEIR000F RB55AE105R3F RB55AE10R0O5F RC20GF332K RC20GF471K RC20GF472K 2420 501
16. 1 ma 0 10 ma and 0 100 ma depending upon ex ternal circuitry conditions by varying the current into the base of the transistor under test This is accomplished by using IC potentiometer R24 across Changed 30 September 1963 1 CONTROL PA i EL E I uoross 1 905 1 6 OL 1 T O 33A1 3 206 1 the 1 5 volt tap of battery BT2 when the CIRCUIT IMPEDANCE switch S5 is in the NORMAL position and across the 4 5 volt tap of battery BT2 when the CIRCUIT IMPEDANCE switch S5 is in the LOW po sition This arrangement gives a variable biasing network for the base to emitter circuit of the tran sistor under test 8 AUDIO OSCILLATOR See figure 2 1000 cps Colpitts Oscillator consisting of a tuned circuit transistor Q1 and its associated biasing and feed back networks is used to generate the A C test signal The output of the oscillator is A C coupled into an emitter follower Q2 whose output is then coupled into the step down transformer T1 by means of the BETA CAL potentiometer R8 located in the emitter circuit of the amplifier The output of T1 is connected to the variable resistance bridge para graph 9 through the FUNCTION SELECTOR switch S4 The amplitude of the test signal is controlled by the BETA CAL potentiometer R8 9 VARIABLE RESISTANCE BRIDGE CIRCUIT See figure 2 a One leg of the bridge circuit is the base to emitter input im
17. CAUSE ACTION Meter deflects to the extreme Shorted resistor R32 Replace defective right when the two 4 5 volt resistor batteries BT2 and BT3 are tested Defective battery BT1 Replace defective No power or defective power battery to audio oscillator Check continuity and repair defective wiring Open circuit Defective Battery switch S1 Replace defective Switch Defective battery BT1 Replace defective No power or defective power battery to A C amplifier Check continuity and repair defective wiring Open circuit Defective Battery switch S1 Replace defective switch Defective battery BT3 Replace defective battery No power or defective collector voltage Check continuity and repair defective wiring Replace defective switch Open circuit Defective COLLECTOR VOLTS switch S3 Replace defective switch Defective Battery switch S1 Defective TYPE selector switch S2 Replace defective switch Defective battery BT2 Replace defective battery Defective base current Check continuity and repair defective wiring Open circuit Replace defective switch Defective battery switch S1 Defective CIRCUIT IMPEDANCE switch 55 Replace defective switch Replace defective potentiometer Defective IC potentiometer
18. Either plug it into socket located on control panel identified as EB C or perform step a of paragraph 27 b Switch Z OHMS CIRCUIT potentiometer to OUT OF CIRCUIT position c Perform steps b through e paragraph 27 d Place FUNCTION SELECTOR switch to ICBO and Current Range switch to X100 e Turn Battery switch to the right and monitor the ICBO scale of the meter for leakage current If current reading is low release Battery switch and place Current Range switch to X10 or X1 de pending upon what current is measured f Perform steps f g 1 and m paragraph 29 IN CIRCUIT DIODE TESTS Perform the following procedure for the in circuit diode test a Connect the three colored banana plugs of the test lead assembly to their respective colored binding posts E B and C on the tester Then connect the other end of the test leads to the diode to be tested The green lead is connected to cathode end blue lead to anode and the yellow lead is left open circuited b Setthe TYPE selector switch to DIODE and set the IC and BETA CAL potentiometers to their mini mum positions c Place CIRCUIT IMPEDANCE switch to LOW or NORMAL depending on circuit impedance set Current Range switch to X10 Note The setting of the COLLECTOR VOLTS switch is immaterial in this test because this supply is not used in an in circuit diode test 1 1 E T O 33A1 3 206 1 d Place the FUNCTION SELECTOR switch to
19. P 1600 ohms 3800 ohms 22 5V DC 2 9V DC 0 13V P P 0 018V P P 1100 ohms 12K 0 92V DC 12 5V DC 0 094V P P 14 5V P P Figure 20 Table of A C Amplifier Circuit s Voltage and Resistance Values c Using Multimeter Hickok Model 456 check the d c voltages of transistors Q1 and Q2 with respect to ground See figure 22 for nominal voltage values d Using the Oscilloscope Model 1805A observe the output waveform of the audio oscillator at the top of choke L1 figure 26 it should be a sine wave To check the frequency connect Oscillator Model 202C set to 1000 cps to the External sweep cir cuit of the oscilloscope make sure the oscilloscope s Horizontal display switch is in the External position and the magnifier is inthe 5X position the audio oscillator of the tester is tuned to 1000 cps a single Lissajous pattern will be obtained If the audio oscillator is not properly tuned vary the slug of choke Li figure 26 until a single Lissajous pat tern is obtained e An alternate method of testing the audio os cillator is to connect Electronic Counter Model 523B to the vertical signal output jack of the oscilloscope The oscilloscope s Horizontal display switch should be in the Main sweep normal position and the mag nifier on 1X position The input signal to the os cilloscope should be from the top of choke Li Then measure the frequency directly with the elec tr
20. R24 Defective FUNCTION SELECTOR switch S4 Replace defective switch Figure 17 Troubleshooting Chart Sheet 2 of 3 20 Ca m MPO Cd ks Lu Em T O 33A1 3 206 1 Section I Paragraphs 51 to 56 TROUBLE PROBABLE REMEDIAL CAUSE ACTION Power circuits check out Refer to figure 18 and check voltages at the binding posts but switching circuit is When an incorrect reading is obtained isolate the trouble manfunctioning to the defective component in the circuit set up by the particular combination of switch settings Then replace the defective component and calibrate the tester as out lined in paragraph 52 Power checks out but audio oscillator is malfunctioning Refer to figure 19 and perform voltage and resistance measurements at the points indicated If an incorrect reading is obtained isolate the trouble and replace de fective component this fails to correct the malfunction calibrate the audio oscillator as outlined in paragraph 52 In either case re calibration of the audio oscillator will be necessary Power checks out but amplifier is malfunctioning Refer to figure 20 and perform voltage and resistance measurements at the points indicated If an incorrect reading is obtained isolate the trouble and replace de fective component If this fails to correct the mal function calibrate the amplifier as outlined in paragraph 52 In either case re cali
21. TESTS The test porcedure for the out of circuit diode test is as follows a Connect the three colored banana plugs of the test lead assembly totheir respective colored binding posts E B and C on the tester Then connect the other end of the test leads to the diode to be tested The green lead is connected to the cathode end blue lead to anode and the yellow lead is left open circuited b Setthe TYPE selector switch to DIODE and set the IC and BETA CAL potentiometers to their mini mum positions c Place CIRCUIT IMPEDANCE switchto NORMAL and Current Range switch to X10 d Set COLLECTOR VOLTS switch to 1 5 e place FUNCTION SELECTOR switch to ICBO and turn Battery switch to the right Now read the leakage current of the diode on the meter then re lease the Battery switch If the meter reading is high the diode is shorted or very leaky f Place FUNCTION SELECTOR switch to Ic and turn Battery switch to the right Adjust the IC po tentiometer until the meter reads 0 1 MA Under Section I Paragraphs 30 to 34 this condition the meter is actually reading 1 MA 5 Place Z OHMS CIRCUIT potentiometers to their OUT OF CIRCUIT position h Place FUNCTION SELECTOR switch to RIN TRANSISTOR and turn Battery switch to the right Increase the amplitude of the audio oscillator by varying the BETA CAL potentiometer until the meter reads half scale Then balance the bridge by varying the RIN TRANSISTOR potentiometer until nul
22. battery test scale 47 TROUBLE SHOOTING 48 GENERAL Incase of malfunction ofthe tester investigate and remedy the trouble immediately to prevent damage to the equipment Under no cir cumstances should the equipment be operated if it does not function properly See figure 17 for in dication of trouble probable causes and remedial action to be taken to restore equipment to the re quired standards See figure 2 for the schematic wiring diagram 49 DISASSEMBLY 50 GENERAL The tester is disassembled only to the extent necessary for inspection paragraph 46 troubleshooting paragraph 47 repair or replacement of parts paragraph 51 and calibration paragraph 52 Refer to section II of this manual for the parts break down which includes parts location and parts de Scriptions General disassembly instructions are given below a Remove the ten screws located near the outer edge of the control panel b Gently lift panel assembly out of its case c Disconnect jack J1 from plug Pl d To remove a switch or potentiometer proceed as follows p i i E 4 TROUBLE PROBABLE REMEDIAL CAUSE ACTION T O 33A1 3 206 1 Section I No deflection of meter when All three batteries are Replace defective all batteries are tested completely dead batteries Check continuity and repair defective wiring Replace defective crystal Open circuit Shorted crystal C
23. fective replace defective components Paragraph definitely the reliability of the indicationsor readings provided by the tester These instructions further outline the steps required to restore the original accuracy of such indications or readings Cali bration procedures which are explained in the fol lowing paragraphs are audio oscillator calibration amplifier calibration Z OHMS CIRCUIT potentio meter knobs RIN TRANSISTOR knob and final check 54 FREQUENCY OF CALIBRATION CHECKS Per form calibration only when the tester is suspected of being defective repaired 55 TEST EQUIPMENT Test equipment required for calibration of the tester is listed in figure 21 56 AUDIO OSCILLATOR CALIBRATION Calibrate the audio oscillator as follows a Remove the ten screws located near outer edge of control panel and gently lift panel assembly out of its case Leave the cable assembly connected to the case b Turn Battery switch to the right and rotate BETA CAL potentiometer to its maximum position Change 7 21 FUNCTION SELECTOR SWITCH IMPEDANCE VOLTS Pot HETA SAL Switch Switch Position Position Position B B C E C E B 8 E C E B B C E C E B 0 0 0 0 0 0 NORMAL NORMAL 41 5 41 5 0 1 5 41 5 1 5 41 5 NORMAL 3 0 43 0 3 0 43 0 0 3 0 43 0 0 0 gt NORMAL 44 5 44 5 4 5 44 5 44 5 44 5
24. for testing the transistor 1 5 3 4 5 GS a EC ES T O 33A1 3 206 1 Section I CONTROL or INDICATOR POSITION FUNCTION or SCALE Battery switch S1 TYPE selector switch S2 COLLECTOR VOLTS switch S3 FUNCTION SELECTOR switch S4 OPERATE BATT TEST Energizes tester circuitry for testing a transistor With FUNCTION SELECTOR switch 84 in position 1 ICBO the tester and its associated circuitry is de energized and the 22 5 volt battery BT1 is tested under a fixed load of 3 3K With FUNCTION SELECTOR switch 84 in position 2 IC the two 4 5 volt batteries BT2 and BT3 are tested De energizes the tester Sets the correct polarity of the applied voltages to the PNP transistor under test Sets the correct polarity of the applied voltages to the NPN transistor under test With FUNCTION SELECTOR switch S4 at Ic meter Mi is reversed Shorts out current limiting resistors R14 R15 and R16 Removes collector voltage supply in positions 2 to 6 of FUNCTION SELECTOR switch S4 De energizes the 4 5 volt battery BT3 potential to the collector of the transistor under test Applies voltage to collector of the transistor from battery BT3 in 1 5 volt steps With the Battery switch S1 to BATT TEST position the tester and its associated circuitry is de energized and the 22 5 volt battery BT1 is tested under a fixed load of 3 3K In the Ic po test Battery switch Sl in O
25. the Ryy TRANSISTOR potentiometer Then tighten the setscrews 61 FINAL TEST Perform an out of circuit transistor test as explained in paragraph 28 and note its Beta Place the same transistor in a functionable circuit and perform an in circuit transistor test as explained in paragraph 27 and note its Beta Compare these Beta readings to the listed Betas in the transistor manufacturer s literature If this test is satisfactory it can be assumed that the tester is working properly CHEN T O 33A1 3 206 1 Section I 61A USE OF TRANSISTOR REFERENCE CHART The transistor Reference Chart is to be used as a guide in evaluating the quality of transistors In an effort to simplify the Chart as much as possible only the pertinent information necessary for testing is given For any additional information the transistor manufacturer s literature should be consulted To expiain the use of the Transistor Reference Chart each colum of the chart is described as follows Iype This column specifies the type of transistor PNP or NPN The Type Selector switch should be set accordingly Max Icbo This column specifies the maximum allowable leakage current If the leakage current of the transistor under test exceeds this value it can be considered out of tolerance or defective The Collector Voltage used for this test should be 4 5V unless otherwise noted This test must be performed out of circuit See 80 test procedure in the manual of
26. transistors in circuit The IC po tentiometer R24 is set to zero or its minimum position Note the shunt leakage current on the 0 1 0 ma scale of the meter and the appropriate multi 5 Section I Paragraph 16 MI USED AS MICROAMMETER TRANSISTOR UNDER TEST T O 33A1 3 206 1 Figure 3 ICBO Test Circuit plier of the Current Range switch S5A and S5B should be used that is X1 X10 or X100 Under these circumstances the meter is reading the stray leak age current flowing in the external circuitry due to the collector supply voltage The IC potentiometer is then adjusted for one additional milliampere over the previously noted reading With this setting one milliampere of collector current wili flow through the transistor which is considered standard for a small signal beta test If a larger collector current is desired the Ic potentiometer can be adjusted to C5 O OUT OF CIRCUIT R 500 Figure 4 I Test Circuit the desired value 16 BATTERY TEST CIRCUIT 2 See figure 2 When the Battery Switch S1 is placed in the BATT TEST position the quality of the two 4 5 volt bat teries BT2 and BT3 is determined by reading the dual colored scale of the meter If the pointer of the meter is in the red portion of the scale the batteries are low if it is in the green portion of the scale the batteries are good COLLECTOR VOLTAGE SUPPLY TRANSISTOR UNDER 53 TEST x100 XIO XI e R19 R
27. 1122 2N1122A 2N1123 2N1124 2N1125 2N1126 2N1128 2N1129 2N1130 2N1131 2N1131A 2N1132 2N1132A 2N1132B 2N1139 2N1140 2N1141 2N1142 2N1143 2N1144 2N1145 2N1149 2N1150 Py joan aeuo JP euge S e Pe J e co Pere OT En En En Q Qn Ch Qn EN EN n MNA 1 902 TVEE OL DV9Z 96 Ioquisdad ST po uxuo 2N1151 2N1152 2N1153 2N1154 2N1155 2N1156 2N1158 2N1158A 2N1169 2N1170 2N1171 2N1175 2N1175A 2N1176 2N1176A 2N1176B 2N1177 2N1178 2N1179 2N1180 2N1185 2N1186 2N1187 2N1188 2N1191 2N1192 2N1193 2N1194 2N1195 D IR C5 C5 III on en 66 5 mi a Q On O1 O1 Aa Y YN ON q ON ON a n Q ON ON ON ON ON ON On c poe mum m m aar ooo ooo 8 oo oooooooo meet ER sa SG GE A T oooooooooooo e T 902 6 1V OL p961 19qUISDIA GT pe3uvu HVIT 2N1196 2N1197 2N1198 2N1199 A 2N1204 A 2N1205 2N1206 2N1207 2N1217 2N1218 2N1219 2N1220 2N1221 2N1222 2N1223 2N1224 2N1225 2N1226 2N1228 2N1229 2N1230 2N1231 2N1232 2N1233 2N1234 2N1238 t gt epe EPP PSP gt P 2 gt pap Aaa gio On ON ON o O1 o YA o c ON c
28. 12 05 2015 Hickok 1890M Tester Page 1 of 3 1 Summary Hickok Model 1890M In circuit Transistor Tester S N 60947 3 Original condition is good Chassis marked 5941 0092 NSN 6625 00 993 3389 TEST SET SEMICONDUCTOR DEVICE NIIN 00 993 3389 DESIGN CONTROL REFERENCE 902 353 MANUFACTURERS CODE 28569 Instruction service manual is T O 33A1 3 206 1 air force Similar unit built under AF contract AF 36 600 13288 Stock number 6625 731 5716 Meter 50uA UTC HVC 4 Variductor 0 1H 70 200 30m ADC UTC TFARX13YY UTC DO T11 transistor transformer 10K 2K CT Industrial transformer corp 3250 84 10Hy 10mA 1359 DCR Astron ED 100uF 50V 6418 EKC RN7 resistors Electrolytic marked 6304 Bourns trimpot Powering 14 pins 5 pins not used BTI Red J Purple K 22 5V eg ER763 or Burgess 4156 battery Red amp purple twisted pair to 100uF 50V can to battery switch S1 pur to wafer 6 red to wafer 1 2 BT2 White yell C 40V White Orange B 3V Yellow black A 4 5 eg ER 761 T or Burgess 2370 OV yel blk to battery switch S1 wafer 5 Wh or to circuit impedance S5 wafer 1 Wh yel to battery switch S1 wafer 4 BT3 White red D 40 Brown E 1 5V Orange F 3V Yellow H 4 5V eg ER 761 T or Burgess 2370 Used for Collector Volts selection circuit 4 5V yel to collector volts switch S3 3V or to collector volts switch S3 1 5V br to collector volts switch S3 0 yel rd to collector volts switch S3 and battery s
29. 20 Pu T O 33A1 3 206 1 17 Z OHMS CIRCUIT See figure 5 a To determine the Z ohms circuit input im pedance it is necessary to separate the external input circuit impedance from the transistor input re sistance This is accomplished by reversing the bias on the transistor so that it is cut off thus separating the external input circuit impedance from the tran sistor input resistance b The external input circuit impedance forms one leg of the bridge circuit and its value is determined by varying the Z OHMS CIRCUIT potentiometers R9 and R11 until a null is indicated on the sensitive a c voltmeter tied across the bridge The value of this external input circuit impedance can be read directly from the calibrated dials of the Z OHMS CIRCUIT potentiometers This null must be made very care fully because it can affect the next test which is the RIN of the transistor c If the transistor is out of circuit the external input impedance is almost infinite Therefore the Z OHMS CIRCUIT potentiometers must be removed from the bridge circuit This is accomplished with a SPST switch an integral part of R9 which is ganged to the shaft of the small knob of the Z OHMS CIRCUIT potentiometer This switch must be placed to the OUT OF CIRCUIT position to remove the Z OHMS CIRCUIT potentiometers from the bridge cir cuit 18 RINTRANSISTOR CIRCUIT Seefigure6 The dynamic input resistance of the transistor is de termi
30. 2420 507 2660 907 MQZFP 5 1M 10 RC20GF522K 2N651A RC20GF103K T O 33A1 3 206 1 Figure 31 Terminal Board Assembly TB4 DESCRIPTION 1234567 TERMINAL BOARD ASSEMBLY TB4 TERMINAL BOARD ASSEMBLY See item 34 figure 26 for next higher assembly RESISTOR FIXED WIREWOUND 1 ohm 1 0 15 w MIL R 93 RESISTOR FIXED WIREWOUND 105 3 ohms 1 0 15 w MIL R 93 RESISTOR FIXED WIREWOUND 10 05 ohms 1 0 15 w MIL R 93 RESISTOR FIXED COMPOSITION 3 3 K ohms 10 1 2 w MIL R 11 RESISTOR FIXED COMPOSITION 470 ohms 10 1 2 w MIL R 11 RESISTOR FIXED COMPOSITION 4 7 K ohms 10 1 2 w MIL R 11 BOARD Terminal staked 5 4 9 9 8 9 8 TERMINAL BOARD ASSEMBLY TB3 TERMINAL BOARD ASSEMBLY See item 36 figure 26 for next higher assembly BRACKET Terminal board CAPACITOR FIXED PAPER DIELECTRIC 1 uf 10 50 v dc Mfd by 82376 RESISTOR FIXED COMPOSITION 3 9 K ohm 10 1 2 w MIL R 11 TRANSISTOR Mfd by 04713 RESISTOR FIXED COMPOSITION 10K ohms 10 1 2 w MIL R 11 Section II Parts Breakdown T O 33A1 3 206 1 CPOSAIEB224K MQZFP 5 2M 10 CPOSAIEB104K TF4RX13YY DO T11 RC20GF393K RC20GF101K RC20GF183K RC20GF221K 2420 503 5145 560 No Number No Number 8825 138 763 3030 60 M1 14F 2106 08 00 8825 141 2370 38 Change 12 1 DESCRIPTION 23 4 5 6 7 TERMINAL BOARD ASSEMBLY TB3 Co
31. 25 993 3389 hereafter referred toas tester The tester is manufactured by The Hickok Electrical In strument Company Cleveland Ohio 3 PURPOSE AND FEATURES OF EQUIPMENT The tester is designed to test all small and med ium power transistors and diodes directly in or out of their circuits A portable aluminum case houses the complete equipment Access to the control panel is provided by the detachable top case in which the test lead assembly is stored 4 SPECIFICATIONS Principle features and char acteristics of the tester are listed below Batteries required 1 22 5 volt No 763 not supplied Eveready 2 4 5 volt No 2370 ST Burgess Meter scales ICBO Ranges 0 50 ua 0 500 ua and 0 5 ma IC Ranges cc 0 1 0 ma 0 10 ma and 0 100 ma Beta Ranges 0 50 0 100 0 200 and 0 400 5 for Circuit Im pedances above 25 ohms on the 0 100 Beta Beta Test Accuracy Meter sensitivity 50 ua 100 mv AC test signal Signal assa 2933 1000 cps sine wave with a variable amplitude Calibration setting 5 ua Base Current for the 0 100 Beta Range Transistor input re sistance R2nge 50 10 000 ohms Circuit input imped ance Range 25 100 000 ohms Collector voltages 0 1 5V 3V 4 5V Transistor complement Type_ i Function Q1 Q2 2N651A 1000 cp Oscillator Q3 2N650A A C Meter Amplifier 1st Stage Q4 Q5 2N651A A
32. 356 2N1357 2N1370 2N1371 2N1372 2N1373 2N1374 2N1375 CCC C3 C2 gt 1 29 On OD O Q CI OO pai bed Lin pega a e e ol m I JE 8 RR n on Ya On On On Q ON ON O1 ON YA On Q Q ON Q ON ON O1 Q q ag 01 t T 90Z E TVEE OL F961 19quaJaq GT peSueu 95 2N1376 2N1377 2N1378 2N1379 2N1380 2N1381 2N1382 2N1383 2N1384 2N1386 2N1387 2N1388 2N1389 2N1390 2N1395 2N1396 2N1397 2N1405 2N1406 2N1407 2N1408 2N1409 A 2N1410 A 2N1411 2N1413 2N1414 Notes 6 Notes 6 Notes 6 Notes 6 Notes 6 Notes 6 2000000000 Note 8 e Oo n 3 3 OI ww ooo On O1 n n ON Q Q ON ON YN Y Y YA Y Y ooo oo 1 oi Nooo eg eu gc pn ue I e e am Serene PPM PE E tmt Ns t v 9 X W O1 O1 n o 1 OCS 3 Ma gt 3 1 905 1 6 6 ONL 6961 190190 05 pabueyo WV9c Gas mw ML Model 1890 M Test Data For Burroughs Devices Max Transistor po DS 100291 GVL 20121 GVL 20301 GVL 20122 GVL 20078 GVL 20072 GVL 20076 GVL 20228 GVL 20229 GVL 20287 Dual Transistor cannot be tested The following Transistors cannot be tested Too High Powered DS 100444 DS 100445 DS 100447 DS 100448 GVL 20077
33. 4 5 01 0 100 2N218 4 5 01 0 110 Ps 2N219 4 5 01 0 110 2N220 4 5 00 5 2N223 4 5 01 0 150 2N224 4 5 10 0 2N225 RETA 20 2N226 10 0 2N227 BETA 20 2N228 5 10 0 100 2N229 4 01 0 t NOTE 3 2N232 00 5 039 2N233A 0150 NOTE 3 2N233 4 5 01 0 NOTE 3 2N238 4 5 02 0 2N240 3 0 00 5 2N241 1 5 50 0 2N241A 1 5 50 0 2N243 4 5 05 0 2N244 4 5 05 0 2N247 4 5 01 0 2N248 4 5 00 5 2N264 4 5 10 0 055 2N265 4 5 01 0 2N269 4 5 01 0 2N274 4 5 01 0 12N279 155 0055 040 2N280 1 5 03 0 075 Change 8 26E Section I T O 33A1 3 206 1 Dee Transistor Type Notes 2N281 4 5 2N282 PAIR OF 2N281 W 2N283 006 0 4 5 2N284A 006 0 4 5 2N284 006 0 4 5 i 2N292 000 5 1 5 NOTE 6 2N293 000 5 1 5 NOTE 6 2N299 003 0 3 0 2N300 003 0 3 0 2N306 009 0 4 5 9 2N311 025 0 1 5 2N312 003 0 1 5 NOTE 7 i 2N315A 002 0 4 5 2N316 002 0 1 5 Pb 2N317 002 0 1 5 i 2N316A 002 0 4 5 2N317A 002 0 4 5 E 2N319 006 5 1 5 d 2N320 006 5 1 5 2N321 006 5 1 5 2N322 008 0 4 5 2N323 008 0 4 5 2N324 008 0 4 5 2N327A 040 0NA 4 5 2N327 050 0NA 4 5 2N3278 000 4NA 1 5 I 2N328A 040 0NA 4 5 2N328 050 0NA 4 5 L 2N328R 000 4NA 1 5 2N329A 040 0NA 4 5 2N329 050 0NA 4 5 2N329B 000 4NA 1 5 2N3304 000 4 4 5 i 2N330 050 0NA 4 5 2N331 006 0 4 5 T 2N3324 002 0NA 4 5 kd 2N332 000 8 4 5 2N333A 002 0NA 4 5 gt 2N333 000 8 4 5 2N334A 002 ONA 4 5 i 2N334 000 8 4 5 T 2N3354 8 002 0NA 4 5 ai 2N335 000 8 4 5 2N336A 002 0NA 4 5 2N336 000 8 4
34. 4370 HVC 4 CHOKE Variductor Mfd by 89665 BSX 5100 CAPACITOR FIXED ELECTROLYTIC 100 uf 50 v dc Mfd by 76149 2660 903 BRACKET Chassis left 3225 391 CHASSIS Tester Figure 27 Terminal Board Assembly TB6 33 Section II T O 33A1 3 206 1 Parts Breakdown DESCRIPTION 1234 56 TERMINAL BOARD ASSEMBLY TB6 2420 516 TERMINAL BOARD ASSEMBLY See item 1 figure 26 for next higher assembly 2660 906 BRACKET Terminal board RN70B4993F RESISTOR FIXED FILM 499 K ohms 1 1 2w MIL R 10509 RN70B2003F RESISTOR FIXED FILM 200 K ohms 1 1 2w MIL R 10509 amp e RB55AE20R20F RESISTOR FIXED WIREWOUND 20 2 ohms 1 0 15 w MIL R 93 RB55AE222R2F RESISTOR FIXED WIREWOUND 222 2 ohms 1 0 15 w MIL R 93 RC32GF4R7K RESISTOR FIXED COMPOSITION 4 7 ohms 10 1 w MIL R 11 RC20GF470F RESISTOR FIXED COMPOSITION 47 ohms 10 1 2 w MIL R 11 RC20GF471K RESISTOR FIXED COMPOSITION 470 ohms 10 1 2 w MIL R 11 RC20GF472K RESISTOR FIXED COMPOSITION 4 7 K ohms 10 1 2 w MIL R 11 2420 502 BOARD Terminal staked Figure 28 Terminal Board Assembly TB2 DESCRIPTION 1234567 TERMINAL BOARD ASSEMBLY TB2 2420 506 TERMINAL BOARD ASSEMBLY See item 15 figure 26 for next higher assembly IN91 SEMICONDUCTOR DEVICE DIODE Germanium M d by 03508 RC20GF224K RESISTOR FIXED COMPOSITION 220K ohms 10 1 2 w MIL R 11
35. 5 1 2N337A 040 ONA 4 5 j 2N337 000 5 4 5 2N338A 040 0NA 4 5 2N338 000 5 4 5 2N339A 000 4 4 5 i 2N339 000 4 4 5 2N340A 000 4 4 5 2N340 000 4 4 5 I 2N341A 000 4 4 5 i 2N341 000 4 4 5 t 2 362 000 4 435 2N343 B 000 4 4 5 7 2N344 003 0 3 0 2N345 003 0 3 0 2N346 003 0 3 0 i 2N354 070 0NA 4 5 2N355 070 0NA 4 5 2N356A 005 0 4 5 2N356 005 0 4 5 2N357A 005 0 4 5 2357 005 0 4 5 2N358A 005 0 4 5 26F Changed 13 June 1969 T O 33A1 3 206 1 Section I Transistor Type 2N358 2N359 2N360 2N361 2N362 Le 2N363 2N364 2N365 2N366 LA 2N367 2N368 2N369 2N370 2N371 X 2N372 2N373 2N374 2N377 2N381 2N382 2N383 2N384 2N385 2N385A 2N388A 2N388 2N393 2N394 2N395 2N396 A 2N397 2N398A 2N3988 2N402 2N403 r3 2N4044 A 2N405 2N406 2N407 2N408 2N409 2N410 2N411 2N412 E 2N413A E 28413 d 2N414A 2N414 2N416 2N417 2N422 2N425 2N426 2N427 2N428 2N438 A 2N439 A 2N440 A 2N444A 2N444 2N445A 2N445 2N446A 2N446 2N447A 2N447 2N441B 9 9 89 9 9 9 9 9 9 9 48 4 9 9 9 9 9 9 9 9 9 9 9 9 89 9 49 9 9 9 8 9 8 9 9 9 9 49 9 EE Y Un VD VN Un Un un Un Un n un AAA un UT un Ur Or UM UM On VD un wn un
36. 9 4 9 95 49 95 9 95 9 9 9 95 5 9 95 9 9 9 96 9 9 OC 9 9 95 9 9 89 9 9 DA Y C UT UN EVE TEU uad T O 33A1 3 206 1 2N160 A 5 5 01 0 dio 4 5 01 0 2N162 to 4 5 01 0 2N163 4 NOTF 6 2N164A 4 5 9199 MUTE 6 2N165 4 5 01 0 i 4 5 01 0 200 2N1L67 A 0 NUTE 6 2N168 4 5 01 uer 2N169 1 5 01 0 2N169A 4 5 01 0 2N170 4 5 01 0 EN r28174 A 4 0 01 2 2N175 4 5 00 5 2N185 4 5 02 0 2N186 1 5 50 0 2N186A 1 5 50 0 2N187 1 5 50 0 2N187A 1 5 50 0 2N188 1 5 50 0 2N1884 1 5 10 0 2N189 4 5 01 0 2N190 4 5 01 0 2N191 4 5 01 0 2N192 4 5 01 0 2N193 4 5 01 0 NUTE 3 2N194A 4 5 01 0 NUTE 3 2N195 4 5 01 0 300 NOTE 8 2N200 4 5 01 0 060 NOTE 6 2N204 4 5 01 0 120 NOTE 6 2N205 4 5 01 0 035 NUTE 6 2N206 4 5 01 0 2N207 4 5 01 0 2N207A B 4 5 01 0 2N211 4 5 01 0 NOTF 3 2N212 4 5 01 0 N TE 3 2N213 4 5 01 0 250 2N213A 4 5 01 0 250 2N214A 1 5 10 0 2N215 01 0 2N216 4 5 01 0 NUTE 3 2N217
37. A ON AAA a ON Y ON aa a ON ON c S00000000000 T 90Z E TVEE O L UIT 96 1equie2eq GT padueyo 2N582 2N583 2N584 2N585 2N587 2N591 2N592 2N593 2N594 2N595 2N596 2N597 2N598 2N599 2N600 2N601 2N602 2N602A 2N603 2N603A 2N604 2N604A 2N609 2N610 2N611 2N612 3 5 3 7 3 7 5 5 5 5 5 5 5 5 5 5 5 5 5 3 5 3 SPS Phe daa O Aa O T On ON a ON On a ON ON ON ON ON ON ON Y ON aououcooooooooceo En JR ECT E TONS I 902 TV OIL P96T 1equie28q GT 989 9 S96 PROP OP OTP Q cO O1 co D gt 4 1 4 4 4 4 1 4 4 4 1 1 1 1 1 1 4 4 4 4 4 4 1 1 4 4 4 4 4 5 5 5 5 5 9 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 PRR M OI O OI E m OF OO O O T 900 E TVEE OTL L96 P96T 1equie2eq GI 98 e e 2N652A 2N653 2N654 2N655 2N656 A 2N657 2N658 2N659 2N660 2N661 2N662 231670 2N671 2N672 2N673 2N674 2N679 2N694 2N695 2N696 2N697 2N698 2N699 2N699B 2N700 2N702 5 lt Co C2 C9 gt CD O O wu D I lt gt ER 5 Amas ada aaa i sa c en OT ON EN Cn EN
38. C Meter Amplifier 2nd Stage and 3rd Stage 5 DESCRIPTION 6 GENERAL Six major circuits are incorporated in the tester to provide the means to accomplish the basic tests listed below The circuits are briefly described in paragraphs through 20 a Icpo collector leakage current b Id collector current c Z ohms external input impedance d Rr dynamic input impedance e Beta current gain of a transistor in the common emitter configuration 7 POWER SUPPLY CIRCUIT See figure 2 a The tester and its associated circuitry for test ing a transistor is energized in the OPERATE po sition of the Battery switch Sl The BATT TEST position of this switch will be explained in conjunc tion with the FUNCTION SELECTOR switch S4 para graph 12 because they are interrelated The Bat tery switch is a three position momentary contact center OFF spring return in both directions that is to the left and right The switch always returns to the center position after it has been released b The internal power requirements of the audio oscillator the A C amplifier and meter circuit are supplied by a 22 5 volt battery BT1 The collector voltage for the transistor under test is obtained from a tapped 4 5 volt battery BT3 The collector voltage can be varied from 0 to 4 5 volts in 1 5 volt steps by changing the position of the COLLECTOR VOLTS switch S3 d The collector current can be varied from 0
39. Figure 23 Voltmeter D C Voltages for Amplifier Transistors FES T O 33A1 3 206 1 Section I PRECISION DIVIDER VARIABLE FREQUENCY OSCILLATOR HEWLETT PACKARD MODEL 202C TERMINAL BOARD ASSEMBLY T81 SHIELDED WIRE DISCONNECTED OSCILLOSCOPE HICKOK MODEL 1805A SCREWDRIVER ADJUSTMENT TERMINAL BOARD ASSEMBLY TB2 Figure 24 Amplifier Calibration Test Set Up If the output voltage is higher than 15 5 volts P P adjust the negative feedback resistor R33 by ro tating the screwdriver adjustment counterclockwise to a smaller value the output voltage is less than 14 5 volts P P adjust the negative feedback resistor R33 by rotating the screwdriver adjust ment clockwise to higher value f Check the d c voltage at the collector of the third stage point B is ground figure 24 the voltage should be at least 10 volts dc If it is less negative remove resistor R41 220K and re place it with a 270K resistor Re check the d c voltage 5 With the oscilloscope connected as shown in figure 24 output of 14 5 volts P P to 15 5 volts P P check the waveform The waveform should not be clipped or bottomed the waveform is distorted replace resistor R41 with resistors of other values until the waveform is not distorted Note Don t change the ohmic value of resistor R42 below 10K because this will load the second Stage and shunt the input of the third stage If all the preceding require
40. ION NOTICE Handie in compliance with the distribution statement and destroy by any method that will prevent disclosure of the contents or reconstruction of the document PUBLISHED UNDER AUTHORITY CF THE SECRETARY OF THE AIR FQRCE 15 OCTOBER 1962 CHANGE 12 1JULY 1988 T O 33Al 3 206 1 INSERT LATEST CHANGED PAGES DESTROY SUPERSEDED PAGES LIST OF EFFECTIVE PAGES NOTE The portion of the text affected by the changes is indicated by a vertical line in the outer margins of the page Changes to illus trations are indicated by miniature pointing hands Changes to wiring diagrams are indicated by shaded areas Dates of issue for original and changed pages are Original 0 15 Oct 62 Change 7 15 Oct 74 Change 1 30 Sep 63 Change 8 1 Sep 76 Change 2 15 Apr 64 Change 9 1 Apr 82 Change 3 15 Nov 64 Change 10 1 Jul 82 Change 4 1 Mar 65 Change 11 15 Dec 85 Change 5 13 Jun 69 Change 12 1 Jul 88 Change Q 30 Oct 69 TOTAL NUMBER OF PAGES IN THIS PUBLICATION IS 84 CONSISTING OF THE FOLLOWING Page Change Page Change Page Change No No No No No eu ele e Ku aa ew awe Xe NA VX comes O 0 0 1 n8 uu e uau e e nn s 4 n n n on cones een uu 4
41. N SELECTOR switch to ICBO d Connect base to the green lead emitter to blue lead of the lead assembly the collector is left open circuited e Place Current Range switch to X100 and then turn Battery switch to the right Read the leakage current on the 0 50 ua scale of the meter If the reading is low place Current Range switch to X10 or X1 depending upon how much leakage current is 15 Section I Paragraphs 35 to 40 being measured However release Battery switch when changing current multipliers 35 IMPEDANCE RATIO OF AUDIO TRANSFORMER The impedance ratio of an audio transformer can be determined in the following manner a Connect primary of transformer to the yellow and green leads of the lead assembly b Place IC potentiometer to its minimum po sition Place FUNCTION SELECTOR switch to Z OHMS CIRCUIT and be sure that the Z OHMS CIRCUIT po tentiometers are in the circuit d Place a resistive load across the secondary e Turn Battery switch to the right and increase the BETA CAL potentiometer until the meter reads full scale Then vary the Z OHMS CIRCUIT po tentiometers until null is indicated on the meter Release the Battery switch Read the value of re flected impedance on dial of Z OHMS CIRCUIT po tentiometer Knowing the reflected impedance and the secondary load the impedance ratio can be de termined Also knowing the impedance ratio the turns ratio can also be determined The turns
42. N496 2N497 2N498 A 2N499 2N501 2N501A 2N502 2N502A 2N503 2N504 2N508 or 0 2 OT Qn Wa ja 900000 aa a A Y YA A O A qa ON ON ON ON ON ON ON ON ON ON ON O7 a ON On Pan am ahh IRR a je a I Nw 900000000000000000 ta DO IND DO BO IND CO CO a pei je LI Sou c OOOOOOOIO 1 902 TV E O L d92 p961 19QUI323G GT pesueyD 2N509 2N515 2N516 2N517 2N518 2N519 2N519A 2N520 2N520A 2N521 2N521A 2N522 2N522A 2N523 2N523A 2N524 A 2N525 2N526 A 231527 A 231534 2N535 2N535A 2N535B 2N536 2N537 2N541 NADIA c O1 O O O Q Q ON O1 Qi Q Q Q Qi NNM O1 a ON ON o 5 p coo e So00000000000000000 fe ggg d O Que c M T 902 E TVEE O J 097 F961 1equieoeq ST padueyo 2N542 A 2N543 A 2N544 2N545 2N546 2N547 2N548 2N549 2N550 2N551 2N552 2N559 2N560 2N563 2N564 2N565 2N566 2N567 2N568 2N569 2N570 2N571 2N572 2N576 2N576A 2N578 2N579 2N580 2N581 O1 Go y CO CCC Go 035 02 69 69 C O gt 9 AL Sb 2 D SS app Esas aaa AR SU MA On On a On Y On A
43. NORMAL 0 1 5 0 1 5 1 5 0 41 5 LOW 45 0 4 44 5 5 4 5 0 B C E C E B B C E B C E C E B B C B C E C E B B C E C E B 0 0 0 0 0 0 NORMAL NORMAL 31 5 41 5 4 5 15 0 15 415 0 NORMAL 43 0 43 0 43 0 43 0 0 43 0 43 0 0 NORMAL 4 5 44 5 44 5 44 5 0 44 5 44 5 0 NORMAL 41 5 0 0 1 5 1 5 0 41 5 LOW 44 5 NORMAL NORMAL NORMAL NORMAL NORMAL LOW This table shows where the various switches should be placed and what voltages are to be read at the binding posts of E C E B and B C The plus lead of the d c voltmeter 18 indicated by a sign over the pair of binding posts being measured Figure 18 Table of Switching Circuit D C Voltages 1 om r I uotjoos I 902 IV TOL T O 33A1 3 206 1 Section I 3800 ohms 20 9V DC 11 P P 2700 ohms 4 1V DC 3 1V P P Perform all measurements with respect to ground Place the positive lead of the ohmmeter to ground Figure 19 Table of Audio Oscillator Circuit s Voltage and Resistance Values 100 ohms 0 15V DC 3000 ohms 2 8V DC 0 012V P P 900 ohms 0 92V DC 0 025V P P Note Perform all measurements with respect to ground Place the positive lead of the ohmmeter to ground 300 ohms 1600 ohms 0 3V DC 2 9V DC 0 018V P
44. PARATION FOR USE See figure 8 The tester is not supplied with batteries because batteries deteriorate with age The following complement of batteries should be installed as explained below Symbol Quantity Type BT2 and BT3 2 No 2370 ST Burgess BT1 1 No 763 Eveready a Remove ten screws located near outer edge of control panel b Gently lift panel assembly out of its case and disconnect cable assembly from the panel assembly chassis aec c Remove eight screws that hold battery brackets to case d Place the smaller of the two brackets around battery BT1 and the other bracket around batteries BT2 and BT3 Note When installing batteries in their brackets there Should be sufficient clearance between the lip of the bracket and the battery studs When install ing Military Batteries BA 2 and BA 27 reverse the mounting beackets so that the bracket flanges will be opposite the battery terminal end Use pressboard or cardboard to insure a snug fit for battery BT 1 when installing Military Battery BA 2 e Place battery assemblies in case and secure them to case with the eight screws that were re moved f Connect the various leads to their proper bat teries The wires are color coded and are soldered BATTERY BTI YEL BLK WHT ORN RED PUR 5 u gt Li r z Section I Paragraphs 21 to 25 to lugs Figure 8 shows the color of the leads and where they should be placed Tighten each lug se curely to it
45. PERATE position a reverse voltage is applied across the collector base diode and the emitter is open circuited in this test Meter M1 and the approp riate limiting resistor are placed in series with the circuit With the Battery switch S1 to BATT TEST position the two 4 5 volt batteries BT2 and BT3 are tested Figure 10 Functions of Operating Controls and Indicators Sheet 1 of 3 11 Section I T O 33A1 3 206 1 CONTROL or INDICATOR POSITION or SCALE FUNCTION In the Ic test Battery switch S1 in PS OPERATE position the Ic potentiometer R24 is energized meter M1 and appropriate limiting resistor are switched into the collector circuit and the variable d resistance bridge into the circuit 8 Z OHMS Reverses bias on the transistor under CIRCUIT test and switches meter M1 across the bridge circuit 4 RIN OHMS Switches RIN OHMS TRANSISTOR po TRANSISTOR tentiometer R10 into the bridge circuit Forward biases on the transistor under test and retains meter M1 across the bridge 3 Places meter M1 across monitoring resistor R12 49 9 ohms in the bridge circuit Places meter M1 across monitoring resistor R31 1 ohm in the collector circuit for a Beta reading on meter M1 CIRCUIT IMPEDANCE Places Ic potentiometer R24 across the switch S5C and S5D 4 5 volt tap of battery BT2 Switches the two 10 ohm resistors R28 and R30 into the bridge circuit and shorts out resistor R11 Places Ic
46. Q4 and Q5 with respect to ground See figure 23 for nominal voltage values c Disconnect the shielded wire figure 24 from the input of the amplifier and connect a precision divider consisting of a 20K 1 resistor and a 10 ohm 1 resistor to a variable frequency oscillator Con 24 Changed 30 September 1963 nect the input of the amplifier across the 10 ohm resistor Set the frequency of the oscillator to 1000 cps and then using the VTVM or oscilloscope ad just the voltage across the precision divider to 1 volt P P This will give the amplifier a 0 5 mv input signal d Rotate the Battery switch to the right Monitor meter of the tester and vary the frequency of the variable frequency oscillator If the meter doesn t peak at 1000 cps adjust the slug of choke LS figure 26 until it does peak at 1000 cps Then check the frequency response of the amplifier from 20 cps to approximately 200 kc There should be only one peak and this should occur at 1000 cps If the amp lifier peaks at a low frequency 150 to 400 cps re place transistor Q4 figure 29 with a different 2N651A transistor e Connect the output of the third stage of the amp lifier to the oscilloscope as shown in figure 24 and measure the a c voltage The peak to peak voltage Should be within 14 5 volts P P to 15 5 volts P P which is sufficient to drive the meter to full scale Set Function Selector to position 3 TRANSISTOR 0 15 0 92 0 92
47. R1 Defective meter M1 Replace meter Defective Battery switch S1 Replace defective switch Defective FUNCTION SELECTOR switch S4 Replace defective switch Dead battery BT1 Replace defective battery No deflection of meter when 22 5 volt battery BT1 is tested Shorted capacitor C6 Replace defective capacitor Check continuity and repair defective wiring Open circuit Defective Battery switch S1 Replace defective switch Defective FUNCTION SELECTOR switch S4 Replace defective switch Shorted resistor R25 Replace defective resistor Replace resistor Open resistor R26 Replace defective batteries Both batteries are completely dead No deflection of meter when the two 4 5 volt batteries BT2 and BT3 are tested Check continuity and repair defective wiring Open circuit Replace defective switch Defective Battery switch S1 Defective FUNCTION SELECTOR switch S4 Replace defective switch Replace defective resistor Open resistor R32 Replace defective resistor Open resistor R25 or R26 shorted Meter deflects to the extreme right when 22 5 volt battery BT is tested Figure 17 Troubleshooting Chart Sheet 1 of 3 19 Section I T O 33A1 3 206 1 TROUBLE PROBABLE REMEDIAL
48. RC20GF101K RC20GF150K RC20GF913J RC20GF680K REFERENCE DESIGNATION R39 R40 R41 R42 R43 R44 R45 R46 81 82 85 TB1 TB4 TB6 T1 FIGURE amp INDEX NO 29 11 28 10 28 2 28 12 28 9 28 3 28 11 28 7 26 23 26 11 26 2 26 26 26 28 29 26 18 26 15 28 26 36 32 26 34 31 26 31 30 26 1 27 32 9 Section II PART NUMBER RC20GF332K RC20GF223K RC20GF224K RC20GF103K RC20GF103K RC20GF102K RC20GF150K RC20GF913J 19912 467 19912 456 19912 458 19912 457 19912 455 2420 505 2420 506 2420 507 2420 508 2420 509 2420 516 TF4RX13YY DO T11 29 Section H T O 33A1 3 206 1 E Parts Breakdown i Figure 25 In Circuit Transistor Tester Model 1890M PART ea e INDEX NO DESCRIPTION Tan Fa 1234567 ASSY CODE 4 IN CIRCUIT TRANSISTOR TESTER MODEL 1890M 902 353 TRANSISTOR TESTER IN CIRCUIT 3145 560 CASE ASSEMBLY Portable See figure 33 for breakdown No Number PANEL AND CHASSIS ASSEMBLY See figure 26 for breakdown S 657 3L BB KNOB INDICATOR Mfd by 75376 S 647 3L BB KNOB INDICATOR Mfd by 75376 S 645 5L BB KNOB INDICATOR Mfd by 75376 S 656 3L BB KNOB INDICATOR Mfd by 75376 11505 116 KNOB 11505 115 KNOB INDICATOR 12450 356 LEAD ASSEMBLY TEST 211 CONNECTOR PLUG ELECTRICAL green Mf 83330 211 CONNECTOR PLUG ELECTRICAL yellow Mfd by 83330 211 CONNECTOR PLUG ELECTRICAL blue Mfd by
49. ance of the transistor under test With the FUNCTION SELECTOR switch 84 in position 5 the BETA CAL po tentiometer R8 is used to adjust meter M1 to read CAL SET permitting 5 ua of current to flow in the base circuit of the transistor under test With the Battery switch S1 at BATT TEST and the FUNCTION SELECTOR switch S4 in position 1 condition of battery BT1 is indicated With the Battery switch S1 at BATT TEST and the FUNCTION SELECTOR switch S4 in position 2 condition of the two 4 5 volt batteries BT2 and BT3 is indicated Indicates collector current flow when the potentiometer R24 is used to forward 138 the transistor under test Indicates Beta of transistor under test for full scale calibration of the meter Indicates Beta of transistor under test for 1 2 1 4 and 1 8 scale calibration of the meter Connects to respectively colored banana plugs of lead assembly for in circuit transistor tests Provides connection to transistor for out of circuit tests Used to zero meter M1 Figure 10 Functions of Operating Controls and Indicators Sheet 3 of 3 RED DOT TRANSISTOR HOUSING Figure 11 Transistor Lead Identification 13 Section I Paragraphs 28 to 29 f Place FUNCTION SELECTOR switch to Ic po sition and Current Range switch to X10 Turn Bat tery switch to OPERATE This energizes the tester g Observe the shunt leakage current on the 0 1 MA scale of the meter and apply its p
50. bration of the amplifier will be necessary Figure 17 Troubleshooting Chart Sheet 3 of 3 1 Unsolder or cut leads from terminals 49 gives removal instructions for the replaceable items Section II Parts Breakdown gives infor mation to facilitate ordering of replacement parts Repair should consist only of routine maintenance such as repairing defective wiring connections etc 2 Tag leads 5 Remove knob and locking nut from front of control panel 52 CALIBRATION 4 Remove switch or potentiometer from inside 53 GENERAL This section contains step by step e To remove meter M1 unsolder leads from cry procedures which will enable the operator to check Stal CR1 at rear of meter Unscrew nuts from mounting studs at rear and extract meter from the front of the control panel f To remove binding posts unscrew nuts from mounting studs at rear disconnect terminals and extract binding post from the front of the control panel g To remove bracket mounted capacitors or chokes unsolder and tag leads Remove attaching parts and lift out the component h When removing or replacing a transistor or a component near a transistor observe the following Do not apply excessive heat to the transistors or they will be damaged Use an adequate heat sink to the leads when soldering or unsoldering Cut leads if necessary 51 REPAIR OR REPLACEMENT Individual com ponents of the tester are not to be repaired if de
51. e a go O O O O Y ON Q Q Q Qi Q ON O O Qn O1 O1 agan mm a 6 1 6 3 7 1 1 ono ono N ho B o air of 2N28 47 47 oa 11 16 aan Ue e os epe o e D O Oo 23 5 1 902 TV OL P96T 1equie2e q GT padueyo 396 2N335A B 2N336 2N336A 2N337 2N337A 2N338 2N338A 2N339 2N339A 2N340 2N340A 2N341 2N341A 2N342 2N342A 2N342B 2N343 2N343B 2N344 2N345 2N346 2N354 2N355 2N356 2N356A 2N357 2N357A 2N358 2N358A poe PPP a qe qe P gt PPL P oh JINON ao lt o ATAAIAASOVHMHMSSSSSSSSSSS AAD AD AAD A XJ CJ a Cc On On oci Gi On oc om ON o On ON ON O ON Oi Ot ON Q O1 ON o oi jad pd E Rd nd cad de coocoooooononuo T 903 TVE OL p961 Ilequie eq cT po3ury 695 EM ao GE TO ES RN BA mM Er 5 Rep ED 9 4 5 1 0 9 4 5 1 0 9 4 5 1 0 9 45 1 0 4 5 1 0 4 4 5 1 0 4 4 5 1 0 4 4 5 1 0 8 4 5 1 0 8 4 5 1 0 8 4 5 1 0 12 4 5 1 0 12 4 5 1 0 12 4 5 1 0 5 45 1 0 5 45 1 0 1 5 45 5 45 45 1 5 1 5 1 5 1 5 3 0 m OT 0 0 T 908 TVES OJ 96 1oquie2eq GT pa3ueyo W92 2N394 2N395 2N396
52. eads B Leads B Leads B m E Re E T 903 E TVE OIL qvoc 96 Iequie2eq CT pa3dueyo 2N1034 2N1035 2N1036 2N1037 2N1038 2N1039 2N1040 2N1041 2N1042 2N1043 2N1044 2N1045 2N1047 A 2N1048 A 2N1049 A 2N1050 A 2N1051 2N1052 2N1053 2N1054 2N1056 2N1057 2N1058 2N1059 2N1060 2N1065 TO an a c M pla gau uS Im onm gt O1 en O1 O1 On ON a On ON ON ON ON ON ON OT an ON Bea 1 90 1 88 O L P961 1equieoeq GI podueyo AVIZ 2N1066 2N1072 2N1074 2N1075 2N1076 2N1077 2N1086 2N1086A 2N1087 2N1090 2N1091 2N1093 2N1094 2N1095 2N1096 2N1097 2N1098 2N1101 2N1102 2N1107 2N1108 2N1109 2N1110 2N1111 2N1111A 2N1111B 2N1114 2N1115 2N1118 SEM D b2 62 gt 3 Sa O Or O1 On On O1 O1 On n a ON Ya n O1 Y ON ON ON O aaa Gc ON 4 4 4 4 4 4 1 1 4 1 1 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 1 1 4 c c oc cem oo Q Q Qn Q Qn O O O O O O O O e sa so E A SERT SPS o e 1 902 1V86 0 L 95 p961 Iequiooeq CI pesuryD Bea Transistor Icbo mer Z 5 ZI x 2N1118A 2N1119 2N1121 2N
53. er D C Voltages for Audio 24 6 RIN Test Circuit v e 6 w s s 8 eee 8 Oscillator Transistors 7 Diode Test Circuit sw vas 8 23 Voltmeter D C Voltages for Amplifier 24 8 Battery Wiring Diagram 9 Transistors 9 Operating Controls and Indicators 10 24 Amplifier Calibration Test Set Up 25 I 10 Functions of Operating Controls and 11 25 In Circuit Type Transistor Tester 30 Indicators P Model 1890M 11 Transistor Lead Identification 13 26 Panel and Chassis Assembly 31 12 Typical Detector Circuit 16 27 Terminal Board Assembly TB6 33 13 Typical Transformer Diode Gate Circuit 17 28 Terminal Board Assembly TB2 34 ES 14 Typical Switching Circuit 17 29 Terminal Board Assembly TB1 35 15 Schmitt Trigger Circuit 17 30 Terminal Board Assembly TB5 36 16 Directly Coupled Monostable Multi 18 31 Terminal Board Assembly TB4 37 H vibrator 32 Terminal Board Assembly TB3 38 iy 17 Troubleshooting Chart a wow AU 33 Portable Case Assembly 39 18 Table of Switching Circuit D C 22 Voltages Changed 15 December 1964 i i 65 i EU T O 33A1 3 206 1 Section I Paragraphs 1 to 7 SECTION I USE AND MAINTENANCE 1 INTRODUCTION 2 SCOPE OF MANUAL This technical manual covers installation operation maintenance and parts breakdown of In Circuit Type Transistor Tester Model 1890M figure 1 Federal Stock Number 66
54. est The three positions of the switch are PNP NPN and DIODE The position of the switch is de termined by the circuit element to be tested that is an NPN or PNP transistor or a diode 12 TEST CIRCUITS The various test circuits are set up by the FUNCTION SELECTOR switch Fol lowing is an explanation of these circuits 13 IcBo TEST CIRCUIT See figure 3 In the ICBO test a reverse voltage is applied across the collector base diode of the transistor The emitter is open circuited The transistor must be removed from its circuit for this test The collector cutoff current is read directly on the 0 50 ua scale of the meter and the appropriate multiplier of the CIRCUIT IMPEDANCE switch 85 is used that is X1 X10 or X100 The meter M1 is connected in series with a limiting resistor R17 in this case to the applied voltage battery BT2 and the transistor under test 14 BATTERY TEST CIRCUIT 1 See figure 2 By placing the Battery switch 81to the BATT TEST position the tester and its associated circuitry is de energized and the 22 5 volt battery BT1 is tested under a fixed load of 3 3K The quality of the bat tery is read from the meter scale which is in two colors red and green The red portion of the scale indicates that the battery is low while the green portion of the scale indicates that the battery is good 15 Ic TEST CIRCUIT See figure 4 The IC control adjustment is made in the following manner when testing
55. for breakdown id Es T O 33A1 3 206 1 Section II Parts Breakdown QTY USABLE DESCRIPTION I PER ON 12342709671 ASSY CODE PANEL AND CHASSIS ASSEMBLY Cont 20 9316 RESISTOR Variable 5K ohms 1 4 w Mid by 71590 TVC4 CHOKE Variductor Mfd by 89665 3250 84 CHOKE Reactor 10 henry 10 ma 135 ohms RV4NAYSD251A RESISTOR VARIABLE 250 ohm 10 2w MIL R 94 19912 467 SWITCH ROTARY 3 section 3 position 16 030 1206 LUG TERMINAL Mia by 71590 16925 393 RESISTOR VARIABLE CONCENTRIC front section 1K ohms 10 Z taper rear section 500 ohms 10 linear taper with SPST switch 19912 457 SWITCH ROTARY 6 section 6 position 16925 391 RESISTOR VARIABLE 10K ohms 10 2w Z taper 19912 455 SWITCH ROTARY Dual concentric front section 1 sec tion 3 position rear section 1 section 2 position 16925 391 RESISTOR VARIABLE 10K ohms 10 2 w 7 taper 2420 511 BOARD ASSEMBLY Component em 2420 509 w TERMINAL BOARD ASSEMBLY See figure 30 for breakdown 19370 310 SPACER Terminal board 2660 906 BRACKET Terminal board 2420 508 TERMINAL BOARD ASSEMBLY See figure 31 for breakdown 3825 333 COVER Oscillator 2420 507 3 TERMINAL BOARD ASSEMBLY See figure 32 for break down 2660 904 BRACKET Chassis right 3013 GROMMET RUBBER 5 16 in ID 5 8 in OD 9 32 in thk Mfd by 14370 7859 GROMMET RUBBER 3 16 in ID 5 8 in OD 3 16 in thk Mfd by 1
56. here is 5 ua of current flowing in the base circuit The FUNCTION SELECTOR switch is then placed to the BETA position This switches the meter across the 1 ohm monitoring resistor and the meter reads AC Beta directly 20 DIODE TEST CIRCUIT See figure 7 The circuitry used to perform the diode tests is essen tially the same as that used for the transistor tests The only difference between the circuitry is the functions performed by the TYPE selector switch 2 This switch performs three different functions the first of which is to reverse the meter M1 in the IC Y COLLECTOR VOLTAGE SUPPLY O 0 OF CIRCUIT TRANSISTOR UNDER TEST USED AS A C VOLTMETER Figure 5 Z Ohms Test Circuit Section I T O 33A1 3 206 1 C5 4 OUT OF CIRCUIT COLLECTOR VOLTAGE SUPPLY Figure 6 Ryn Test Circuit position of the FUNCTION SELECTOR switch S4 so that the total current drawn by the diode and its ex ternal circuitry can be measured Secondly it shorts out the current limiting resistors R21 and R22 in the collector circuit which are used to protect the meter if a shorted transistor is tested and lastly it removes the collector voltage supply in the last 5 positions ofthe FUNCTION SELECTOR switch Com pare figure 7 with figure 4 and note the differences UNDER TEST 100 XIO XI Ly e E R19 gt R20 Figure 7 Diode Test Circuit i 5 T O 33A1 3 206 1 21 PRE
57. imately 1 2 of its maximum resistance This wil eliminate an a c short between the base and the emitter of the transistor being tested 40 DETECTOR STAGE Figure 12 shows a de tector stage in which a slightly different test pro cedure is required Place the Z OHMS CIRCUIT potentiometer to the OUT OF CIRCUIT position omit the Z Ohm test and then proceed to test the transistor as outlined in paragraph 27 From fig ure 12 one can see that the diode isn t conducting when the transistor is forward biased by the tester Therefore the Z Ohm test should be omitted because the Z Ohm test reverses the forward biasing volt age applied to the transistor under test In this Figure 12 Typical Detector Circuit E ra T O 33A1 3 206 1 case it also makes the diode conduct which pro duces an erroneous input impedance measurement 41 DIRECT COUPLED CIRCUIT Directly cou pled PNP to NPN circuits require a slightly differ ent test procedure Preset the Z OHMS CIRCUIT potentiometers to the approximate value of the ex ternal input impedance Then omit the Z Ohm test and continue with the other tests The reason for this deviation is that the Z Ohm test reverse biases the transistor under test however at the same time it acts as a collector supply voltage for the previous transistor which then shunts the input impedance of the transistor under test 42 SWITCHING CIRCUITS a When performing a Z Ohm te
58. itry and transistor under test The setting of the CIRCUIT IMPEDANCE switch S5 to LOW or NORMAL will depend upon the imped ance of the external circuitry and transistor under test c In transistor power amplifiers where the ex ternal circuitry and transistor impedances are nor mally low or in any circuit where the impedance is under 500 ohms the LOW position of CIRCUIT IM PEDANCE switch S5 is selected In small signal Section I Paragraphs 8 to 15 RF IF and audio amplifiers where the external cir cuitry and transistor impedances areabove 500 ohms the NORMAL position is selected d When estimating the external circuit impedance at 1000 cps only the circuitry between the base and emitter is considered If there is any doubt as to which position to use the NORMAL position is se lected In either position of the CIRCUIT IMPEDANCE Switch the transistor must be tested below its maximum collector dissipation 10 A C VOLTMETER CIRCUIT See figure 2 The A C voltmeter circuit consists of a three stage amplifier Q3 Q4 Q5 which is highly degenerative to provide excellent stability and a crystal diode bridge detector The input sensitivity of the ampli fier is 0 5 uv P P or 0 176 uv RMS for full scale deflection of the meter 11 TYPE SELECTOR SWITCH CIRCUIT See figure 2 The TYPE selector switch S2 is a three position switch which changes the polarity of the applied voltages to the transistor or diode under t
59. l is in dicated on the meter The value of the dicde s dy namic forward resistance is read from the dial of the RIN TRANSISTOR potentiometer 31 ADDITIONAL TESTS 32 GENERAL The tester is also capable of per forming certain other less common tests Pro cedures for these additional tests are explained be low 33 OUT OF CIRCUIT ICEO TEST FOR SMALL SIGNAL TYPES ICEO is the collector leakage current with the collector reverse biased and the base open circuited In general the ICEO leakage current is considerably larger than ICBO The test is performed in the following manner a Place TYPE selector switch to either NPN or PNP depending upon the type of transistor b Place COLLECTOR VOLTS switch to 1 5 c Place FUNCTION SELECTOR switch to ICBO d Connect collector to the blue lead and emitter to green lead of lead assembly and leave the base open circuited e Place the Current Range switch to X100 and then turn Battery switch to the right Read the leakage current on the 0 50 ua scale of the meter If reading is low place the Current Range switch to X10 or X1 depending upon how much leakage current is being measured 34 OUT OF CIRCUIT IEBO TEST FOR SMALL SIGNAL TYPES 80 is the emitter leakage cur rent with reverse bias applied to the emitter and the collector open circuited The test is as follows a Place TYPE selector switch to NPN or PNP b Place COLLECTOR VOLTS switch to 1 5 c Place FUNCTIO
60. m ON o o e oo Pa e pepe s t ER EE ai ef DO PEU DS oOoooooooonoooooo oooo T 903 E TVES OL 961 1equieoeq GT pasueyD 1 95 211239 2N1240 2N1241 2N1242 2N1243 2N1244 2N1247 2N1248 2N1251 2N1252 2N1253 2N1254 2N1255 2N1256 2N1257 2N1258 2N1259 2N1264 2N1265 2N1266 2N1267 2N1268 2N1269 2N1270 2N1271 2N1272 2N1273 2N1274 2N1275 Ooooooooo Ey m pe SPP SP 0 PPP or Cn C Ct Ct O1 C Cn NN EN ON Q Cn Qn EN n NULA Om e 2 2 So S0000000 000000 Sa e a pa E O PRE DS m eS ta pa pa e T 90 TV OL 985 96 Iequioeoeq GI peSueuj 2N1276 2N1277 2N1278 2N1279 2N1280 2N1281 2N1282 2N1284 2N1285 2N1288 2N1289 2N1299 2N1300 2N1301 2N1302 2N1303 2N1304 2N1305 2N1306 2N1307 2N1308 2N1309 2N1310 2N1311 2N1312 2N1316 3 3 gt 3 N IO D to CO gt 3 gt 3 I I da aa O1 a ooo PEPPERS AA On O1 NN EN n EN Qn n ON Qn Qn EN CN En En ma G 1 OJ MV9Z 96 1equieoeq GT pasuryo 2N1317 2N1318 2N1335 2N1336 2N1337 2N1338 2N1339 2N1340 2N1341 2N1343 2N1344 2N1345 2N1346 2N1347 2N1349 2N1350 2N1351 2N1352 2N1353 2N1354 2N1355 2N1
61. ments are met and the meter is still reading low decrease the value Changed 1 March 1965 25 Section I Paragraphs 58 to 61 of R46 figure 24 in the detector circuit by par alleling it with another resistor the total parallel resistance should not be less than 86K If the meter Stil reads low check the diodes CR3 to CR6 in the bridge circuit After adjusting the value of resistor R46 the meter should be within 2 of full scale 58 LARGE KNOB OF Z OHMS CIRCUIT POTEN TIOMETER R11 Calibrate the large knob 1K to 100K of the Z OHMS CIRCUIT potentiometer as follows a Place a 10K 1 resistor between the Binding Posts E and B using the test lead assembly b Set FUNCTION SELECTOR switch to Z OHMS CIRCUIT c Switch the smaller knob R9 of the Z OHMS CIRCUIT potentiometer to In Circuit and then rotate it counterclockwise to its minimum position d Place the CIRCUIT IMPEDANCE switchto NOR MAL e Turn the Battery switch to the right and in crease the signal by turning BETACAL potentiometer until the meter reads approximately 1 2 scale f Vary the Z OHMS CIRCUIT potentiometer large knob only until a null is indicated g Release the Battery switch Loosen setscrews of large know and set the indicator line of the knob to the 10K point on the inner dial of the Z OHMS CIRCUIT potentiometers Then tighten the set Screws 59 SMALL KNOB OF Z OHMS CIRCUIT POTEN TIOMETER R9 Calibrate the small knob 50 to
62. ned by using the same technique used in de termining the external input circuit impedance para graph 17 However in this test the transistor is biased in the forward direction and the previous settings paragraph 17 of the Z OHMS CIRCUIT Section I Paragraphs 17 to 20 potentiometers R9 and R11 are retained The value of the dynamic input resistance is determined by varying the RIN TRANSISTOR potentiometer R10 until a null is indicated on the meter M1 The value of the dynamic input resistance can be read directly from the calibrated dial of the RIN TRANSISTOR potentiometer 19 BETA CAL AND BETA READ CIRCUITS Cir cuits set up by the BETA CAL and BETA READ positions of FUNCTION SELECTOR switch S4 are the same as that shown in figure 6 except for lo cation of the meter M1 Beta is the current gain of a transistor in the common emitter configuration which is the ratio of the a c collector current to the a c base current To measure both of these currents a monitoring resistor of 49 9 ohms R12 is placed in the bridge circuit and another monitoring resistor of 1 ohm R31 in the collector circuit The meter M1 monitors the voltage drops across these resistors and the AC Beta can be determined Placing the FUNCTION SELECTOR switch S4 to the BETA CAL position meter M1 monitors the vol tage drop across the 49 9 ohm resistor the BETA CAL potentiometer R8 is adjusted until the meter reads 1 2 scale or CAL SET Under this condition t
63. nt CAPACITOR FIXED PAPER DIELECTRIC 0 22 uf 10 100 v MIL C 25 CAPACITOR FIXED PAPER DIELECTRIC 2 uf 10 50 v dc Mfd by 82376 CAPACITOR FIXED PAPER DIELECTRIC 0 1 uf 10 100 v MIL C 25 TRANSFORMER Driver Mfd by 89665 RESISTOR FIXED COMPOSITION 39 K ohms 10 1 2 w MIL R 11 RESISTOR FIXED COMPOSITION 100 ohms 10 1 2 w MIL R 11 RESISTOR FIXED COMPOSITION 18 K ohms 10 1 2 w MIL R 11 RESISTOR FIXED COMPOSITION 220 ohms 10 1 2 w MIL R 11 BOARD Terminal staked Figure 32 Terminal Board Assembly TBS DESCRIPTION 234567 PORTABLE CASE ASSEMBLY CASE ASSEMBLY Portable See figure 25 for next higher assembly CASE Portable cover 5 s lt 6 s 5 5 9 e 9 5 6 5 6 CASE Portable bottom HOLDER Battery s 6 6 s s 5 5 5 5 BATTERY 22 5 v Mfd by 83740 ELECTRICAL CABLE ASSEMBLY CONNECTOR RECEPTACLE ELECTRICAL Mtd by 97954 LUG Terminal Mfd by 78189 HOLDER Battery BATTERY 4 5 v Mfd by 80095 i pr T O 33A1 3 206 1 Section II Parts Breakdown NOT SHOWN E Figure 33 Portable Case Assembly 5 GOVERNMENT PRINTING OFFICE 1972 769 717 SA 1554 39 40
64. of audio oscillator Adjust RIN TRANSISTOR potentiometer to balance the bridge circuit A null will be indicated on the meter when the bridge is balanced The value of the dynamic input resistance of the transistor is read directly from the calibrated dial of the Rmy TRANSISTOR potentiometer m Place FUNCTION SELECTOR switch to BETA CAL Turn Battery switch to the right and adjust BETA CAL potentiometer until meter reads 1 2 scale or CAL SET Then place FUNCTION SELECTOR 14 T O 33A1 3 206 1 switch to the BETA READ and read Beta directly on the meter the Beta of the transistor is higher than 100 recalibrate meter to 1 4 scale and mul tiply meter reading by 2 If Beta of the transistor is higher than 200 recalibrate meter to 1 8 scale and multiply meter reading by 4 Ifthe beta of the transistor is below 50 and an accurate value of Beta is required recalibrate meter to full scale and read Beta directly on 0 50 scale of meter 28 OUT OF CIRCUIT TRANSISTOR TESTS The test procedure for the out of circuit test condition is almost identical to that of the in circuit test procedure The only difference is that the ICBO test is performed and the Z Ohms test is omitted When omitting the Z Ohms test the Z OHMS CIRCUIT potentiometer must be switched to the OUT OF CIR CUIT position The test procedure for the out of circuit transistor test is as follows a Remove transistor which is to be tested from its circuit
65. onic counter If the audio oscillator needs adjust ment vary the slug of choke L1 until the electronic 23 Section I PART NUMBER OR MODEL Hickok Model 1805A or 1805 Hewlett Packard Model 523B Hickok Model 1602 Hickok Model 456 Hewlett Packard Model 202C T O 33A1 3 206 1 Peak to peak voltage meas urement Frequency measurement Calibration of amplifier Meas ures input volt age across divider D c measurement and resistance measurement Calibration source Figure 21 Calibration Test Equipment TRANSISTOR aren pase couzzcror Qi 20 9 Q2 20 9 Figure 22 Voltmeter D C Voltages for Audio Oscillator Transistors counter reads 1000 cps f Place the oscilloscope s Horizontal display switch to the Main sweep normal position and meas ure the output voltage at the collector of transistor Q1 figure 32 The voltage should be 11 volts P P 1 3 volts Then measure the voltage across the secondary winding of transformer T1 figure 32 the voltage should be 1 4 volts 0 2 volts If the voltage is low decrease the value of resistor R4 by paralleling it with a resistor which is larger in value than R4 recheck the voltage across the secondary winding of transformer T1 57 AMPLIFIER CALIBRATION Calibrate the amp plifier as follows amp Turn Battery switch to the OPERATE position b Using Multimeter Model 456 check the d c voltages of transistors Q3
66. operating instructions for the Model 890 Vce This is the Collector to Emitter voltage specified for the Beta test In or Out of Circuit The Collector Voltage Selector Switch should be set accordingly Ic This column gives the Ic current in milliamperes The Beta Test should be made at or near this level The Ic control adjusts this level when the Function Selector is set to the Ic position This adjustment can be made In or Out of Circuit Beta Beta values are given in three columns Minimum Typical and Maximum In some cases only Typical Values arelisted This is because the Transistor Manufacturer only lists the Typical Value in his specification sheets Notes Notes 1 through 9 are listed on page 26C These notes are self explanatory and used in specific cases where de viation from conventional test procedure is required Changed 30 October 1969 26A 26B blank T O 33A1 3 206 1 Section I MODEL 1890M TRANSISTOR REFERENCE CHART NOTES Note 1 Perform Icer test Reverse the emitter and base leads Connect a 30 ohm resistor between the emitter and base terminals Note 2 Perform Icer test Reverse the emitter and base leads Connect a 200 ohm resistor between the emitter and base terminals Note 3 Perm Icer urce Mega Reverse the emitter and base leads Connect a 10K ohm resistor between the emitter and base Cr Note 4 Connect B1 and B2 to the base terminal and test as triode S Note 5
67. pedance of the transistor under test This input impedance can be the parallel combination of the external circuitry impedance of the transistor under test and its dynamic input resistance The balancing leg is provided by the tester it consists of one dual potentiometer Z OHMS CIRCUIT R9 and R11 and a single potentiometer RIN TRANSISTOR R10 which is connected in parallel with the dual potentiometer in the last three positions of the FUNCTION SELECTOR switch S4 The dual po tentiometer is used to null out the external circuit impedance of the transistor under test If an out of circuit test is performed this dual potentiometer must be removed from the circuit A SPST switch which is an integral part of potentiometer R9 is provided to accomplish this condition The single potentiometer RIN TRANSISTOR R10 is used to null out the dynamic input resistance of the transistor b The functions of the CIRCUIT IMPEDANCE switch S5 are to change the circuit constants in the bridge and also to change the applied battery vol tages to the forward biasing network which is used to adjust the collector current of the transistor under test Inthe LOW position the circuit constants are given low resistance values in order to present a low driving impedance to the external circuitry and transistor under test However in the NORMAL position the circuit constants are given nominal values thus presenting a normal driving impedance to the external circu
68. pical Transformer Diode Gate Circuit Section I Paragraphs 41 to 42 Figure 14 Typical Switching Circuit c A Schmitt trigger figure 15 is another cir cuit in which some difficulties may arise when check ing the second transistor of the circuit The for ward biasing network of the tester which is used to adjust the collector current of the transistor under test can also act as a collector supply for the first transistor Eliminate this difficulty by placing a short between the collector and the emitter of the first transistor then proceed to test the second transistor as outlined in paragraph a d Figure 16 is a directly coupled monostable multivibrator To test the three transistors of the circuit open lead A for all of the tests and test transistor Q3 in the usual manner If lead A 18 not opened when the tests on transistor Q3 are per formed the collector voltage supply will be short circuited through the emitter base diode of tran sistor Q2 When testing transistor Qi short the emitter and base of transistor Q2 when testing tran sistor Q2 short the emitter and base of transistor Q1 Tf this isn t done one could mistake the leak age current ICEO of the transistor not under test for a shorted or leaky transistor Then test the transistors as outlined in paragraph a 2nd TRANSISTOR p ADDED JUMPER Ist TRANSISTOR Figure 15 Schmitt Trigger Circuit 11 Section I Paragraphs 43 to 50 Figu
69. potentiometer R24 across the zi 1 5 volt tap of battery BT2 I Places resistors R27 and R29 into the bridge circuit CURRENT RANGE Connects the appropriate meter shunt switch S5A and S5B resistor into the circuit which determines the multiplier used when reading meter Ea M1 Inserts a limiting resistor in series with the meter Ic potentiometer R24 With the FUNCTION SELECTOR switch S4 in position 2 the Ic potentiometer R24 is used to adjust collector current flow of the transistor under test Z OHMS CIRCUIT Any position With the FUNCTION SELECTOR switch potentiometers R9 and except OUT S4 in position 3 the Z OHMS CIRCUIT R11 OF potentiometers are adjusted to provide CIRCUIT the balancing leg of the bridge circuit It also provides direct reading of the external input impedance Figure 10 Functions of Operating Controls and Indicators Sheet 2 of 3 12 T O 33A1 3 206 1 Section I CONTROL or INDICATOR POSITION FUNCTION or SCALE i slig OUT OF CIRCUIT RIN TRANSISTOR potentiometer R10 BETA CAL potentiometer R8 Meter M1 BATTERY LOW GOOD Binding Posts El E2 E3 Socket J2 Zero ADJUSTMENT Removes Z OHMS CIRCUIT potentiometers R9 and R11 from the bridge circuit during out of circuit transistor tests With the FUNCTION SELECTOR switch S4 in position 4 the RIN TRANSISTOR potentiometer is used to balance the bridge circuit and provide direct reading of the dynamic input resist
70. put resistance is 250 ohms There are external circuit conditions under which it is impossible to reverse bias the transistor under 16 T O 33A1 3 206 1 test when performing a Z ohm test This is due to extremely low values of self biasing networks When this condition exists reduce the collector voltage to zero This will reverse bias the transistor under test and the external circuitry impedance can be measured as outlined in paragraph 27 After the Z Ohm test has been made return the COLLECTOR VOLTS switch to its previous position d In some special circuits where the external input circuitry of the transistor being tested ex hibits a large capacitance 0 5 uf or larger across its base to emitter leads disconnect one side of this capacitor before performing the tests 38 R F AND I F STAGE In some R F and I F AVC stages which have both the base and the low side of the collector tank heavily bypassed it is possible even under these adverse conditions that the Z OHM CIRCUIT potentiometers can still null out the external circuit impedance However the value of this impedance will be very low almost a Short circuit When these circumstances exist open one side of these bypass capacitors This will remove the low impedance from the emitter base circuit Then the stage can be tested in the usual manner 39 AUDIO DRIVER STAGE When testing an audio ouput driver stage of a radio set the volume con trol to approx
71. r Electric Corp Fuquay Springs North Carolina 89307 Sprague Engineering Corp Gardena California 89665 United Transformer Co Chicago Illinois 91662 Elco Corp Philadelphia Pennsylvania 97954 U S Components Inc New York New York 67 REFERENCE DESIGNATIONS 68 PURPOSE AND USE a Reference designations are used to identify elec tronic components in the text of this technical manual on the schematic wiring diagram figure 2 and on figures 3 10 9 19 20 and 22to 24 The reference designations are listed below in alpha numeric se quence The Figure and Index No column contains the figure and index numbers of those parts in the 21 Section II T O 33A1 3 206 1 parts lists which have reference designations The REFERENCE FIGURE amp Part No column contains the corresponding part DESIGNATION INDEX NO PART NUMBER numbers of these parts i E2 26 5 DF31GNC b To find a part on the parts location illustrations d figures 25 to 33 when the reference designation is E3 26 6 DF31YC known proceed as follows Ji 33 6 M1 14F 1 Refer to the list of reference designations be low find the reference designation and note the fig J2 26 3 3301 ure and index number LI 26 20 TVC4 2 Turn to the parts list and locate the figure and index number found in step 1 above L2 26 21 3250 84 3 On the proper illustration find the index num L3 26 40 HVC 4 ber of step 2 above E M1 26 10 481 917
72. ratio is the square root of the impedance ratio The formula is as follows TR y Zp Zs 37 GENERAL As with all instruments there are limitations to which this tester can be used There fore this section will help the user of the tester to overcome some of its pit alls by altering the external circuitry of the transistor to be tested or by using a slightly different test procedure when required Various types of circuits with their specific dif ficulties in testing them as well as special tech niquesused to overcome these difficulties are ex plained in paragraphs 38 through 42 The following general considerations should be noted 36 TESTER LIMITATIONS a While following the regular test procedure for an in circuit test on a circuit which has a low external input impedance it is possible that the transistor input resistance cannot be nulled out Under these circumstances it is necessary to in crease the collector current of the transistor under test to decrease its input resistance The limi tations to the above solution are the collector dis sipation of the transistor under test and the shunting effects of the external input circuitry impedance b The maximum ratio of the transistor input re sistance to the external input impedance which can be detected by the bridge circuit is 10 to 1 There fore under the lowest limit of external input im pedance 25 ohms the maximum detectable value of the transistor in
73. rdering replacement parts other than those manufactured by the Hickok Electrical Instrument Company b The vendor s code number enclosed in paren thesis follows the description of the part in the parts list The code numbers are in accordance with the Federal Supply Code for Manufacturers Cataloging Handbook H4 1 The name and address of each ven dor and the corresponding code number are listed below CODE VENDOR S NAME AND ADDRESS 03508 Semi Conductor Products Department of Electronic Components Division of Electronic Atomic and Defense Systems Group General Electric Co Syracuse New York 04713 Motorola Inc Semi Conductor Products Division Phoenix Arizona 12059 Superior Electronics Corp Clifton New Jersey 14370 Continental Rubber Works Erie Pennsylvania 71590 Centralab Division of Globe Union Inc Milwaukee Wisconsin Section II Paragraphs 62 to 68 CODE VENDOR S NAME AND ADDRESS 75376 Kurz Kasch Inc Dayton Ohio 76149 Mallory Electric Corp Detroit Michigan 76545 Mueller Electric Co Cleveland Ohio 78189 Shakeproof Division of Illinois Tool Works Elgin Illinois 80095 Burgess Battery Co Battery Division Chicago Illinois 81483 International Rectifier Corp El Segundo California 82376 Astron Co East Newark New Jersey 83330 Herman H Smith Inc Brooklyn New York 83740 Eveready Division of National Carbon Division of Union Carbide Corp New York N Y 88419 Cornell Dubilie
74. re 16 Directly Coupled Monostable Multivibrator 43 MAINTENANCE INSTRUCTIONS 44 GENERAL Maintenance of the tester consists of periodic cleaning periodic inspection disassembly trouble shooting repair or replacement of parts and periodic calibration No lubrication is required 45 CLEANING Perform all solvent cleaning operations in an ap proved cleaning cabinet or in a well ventilated area Avoid prolonged breathing of vapors Avoid eye and repeated skin contact Keep solvents away from sparks and flames Use approved personal protective equipment goggles face shield when using com pressed air Provide protection from flying particles Do not direct airstream towards self or other per sonnel a Clean the exterior of the tester as required using a lint free cloth soaked with cleaning solvent conforming to Federal Specification P D 680 Type II Exercise catuion to avoid removing any identification markings Dry with com pressed air at not more than 30 psi 46 INSPECTION a Prior to use perform the inspection procedure out lined below 1 Place FUNCTION SELECTOR switch to ICBO 2 Turn Battery switch to BATT TEST and monitor 18 Change 11 T O 33A1 3 206 1 the meter The meter should read in the green GOOD portion of the battery test scale 3 Place FUNCTION SELECTOR switch to 10 4 Turn Battery switch to BATT TEST and monitor meter The meter should read in the green GOOD portion of the
75. roper mul tiplier X10 in this case to determine current flow Note Under these circumstances the meter is read ing the stray leakage current flowing in the ex ternal circuitry due to the collector supply voltage h Adjust the collector current with IC poten tiometer for one additional milliampere over the previously noted reading If the stray leakage cur rent is high 3 4 or 5 MA set collector current to at least twice the noted stray leakage current by adjusting Ic potentiometer Note Power type transistors used in the final audio output stages of transistor radios should be checked with 5 or 10 MA of collector cur rent Do not change current multipliers while the tester is energized i Rotate the VERNIER of the Z OHMS potentio meter to approximately 250 ohms or mid position j Place FUNCTION SELECTOR switch to the Z OHMS CIRCUIT position and turn the Battery switch to the right k Increase amplitude of audio oscillator by turning BETA CAL potentiometer until meter reads approxi matelyhalfscale Balance the bridge by first varying the large controlof Z OHMS CIRCUIT potentiometer to obtain an approximate null adjust VERNIER to obtain a precise null as indicated on meter Value of external input impedance can now be read directly from the calibrated dials of Z OHMS CIRCUIT po tentiometers 1 Place FUNCTION SELECTOR switch to RIN TRANSISTOR turn Battery switch to the right and increase amplitude
76. s stud g Reconnect the cable assembly to the chassis h Careful insert panel assembly back into the case and secure with the ten screws 22 OPERATING INSTRUCTIONS 23 GENERAL Consul the manufacturer s speci fication sheets for values of the transistors to be tested The tests performed by the tester are ICBO Ic Z ohms RIN and BETA These tests must be performed carefully and in the sequence indicated Test procedures are categorized by in circuit transistor tests out of circuit transistor tests in circuit diode tests out of circuit diode tests and additonal tests Note The IcBo test collector leakage current is performed only as an out of circuit test 24 OPERATING CONTROLS ANDINDICATORS The operating controls and indicators are all located on the front of the tester Figure 9 shows the location and figure 10 lists the controls and indicators and the function of each one of their positions 25 TRANSISTOR LEAD IDENTIFICATION For the purpose of quick reference bottom views of the most common types of transistors are shown in figure 11 BATTERY 82 3 L5 c x gt m m o Figure 8 Battery Wiring Diagram Chonged 15 November 1964 9 Section I Paragraphs 26 to 27 T O 33A1 3 206 1 P Ae M lez ms lg ctun N Figure 9 Operating Controls and Indicators 26 PRELIMINARY ADJUSTMENTS AND CONTROL SETTINGS Before attempting to test any transis
77. st on a trans former diode gate circuit figure 13 or on a cir cuit which uses a diode to limit the reverse bias that can be applied to the emitter base junction preset Z OHMS CIRCUIT potentiometers and omit the Z Ohm test The potentiometer setting will depend upon the circuitry involved If the diode is conducting when the transistor is forward biased set the Z OHMS CIRCUIT potentiometers to the approximate value of the impedance between the base and emitter Ifthe diode is cut off when the tran sistor is forward biased set the Z OHMS CIRCUIT potentiometer to the approximate value of impedance between base and emitter in some cases an open circuit If the latter is the case place the Z OHMS CIRCUIT potentiometer to OUT OF CIRCUIT b Figure 14 shows a circuit in which the diode doesn t conduct when the transistor is forward biased the external input impedance is determined by its biasing network and the impedance of the previous stage Follow the procedure outlined in paragraph a above or an erroneous input impedance meas urement will be obtained This is due to the fact that the Z Ohm test reverses the forward biasing voltage of the transistor under test and at the same time it also reverses the voltage applied to the diode in the external circuitry which might cause it to con duct or to become cut off depending upon the polarity of the voltage Check the circuitry before attempt ing to test the transistor Figure 13 Ty
78. tor or diode do the following a Place FUNCTION SELECTOR switch to ICBO Rotate Battery switch to BATT TEST and monitor the meter meter should read on green portion GOOD b Place FUNCTION SELECTOR switch to IC Ro tate Battery switch to BATT TEST and monitor the meter meter should read on green portion GOOD c Rotate the Ic and BETA CAL potentiometers to their minimum positions If the Ic and BETA CAL potentiometers are nof set at their minimum positions possible damage could be incurred to the transistor or diode to be tested d Using a screwdriver on the Zero Adjustment zero the meter 10 27 IN CIRCUIT TRANSISTOR TESTS The test procedure for the in circuit transistor test is as follows a Connectthe three colored banana plugs of the test lead assembly to their respective binding posts E B and C located on the tester control panel Then connect the other end of the test leads to transistor to be tested The yellow lead is connected to emitter green lead to base and blue lead to collector b Set the TYPE selector switch to either the PNP or NPN position depending upon which type of tran sistor is to be tested c Turn Ic and BETA CAL potentiometers to Zero or minimum positions k d Set CIRCUIT IMPEDANCE switch to NORMAL if circuit impedance is above 500 ohms or to LOW if circuit impedance is below 500 ohms e Set the COLLECTOR VOLTS switch to the collector voltage desired
79. witch S1 wafer 4 Collector volts switch output to battery test S1 wafer 3 operate to collector EUT terminal Some circuitry differences to the Hickok 890 Defence search https www logsa army mil etms http www ebaman com index php remo t Equipment Hickok Hickok 890 Issues 3 isolated batteries with multiple voltage taps BT1 uses a 3k3Q test 7mA 150mW and use 1x LM317L and 26 30VDC supply BT2 can use 2x LM317L and 7VDC supply BT3 collector current supply has 100mA range so need to use 3x LM317 regs and 7 VDC supply 12 05 2015 Hickok 1890M Tester Page 2 of 3 NY Z ows m lr CIRCUIT out er cu Ven y ex Ca Skin me RATE TET 8 OF emeu KOO FUNCTION SELECTOR 10 lego and le comi oi Og 12 05 2015 Hickok 1890M Tester Page 3 of 3 SWHO SET soa saN VWOL AH A ES bet gt ts E T O 33A1 3 206 1 TECHNICAL MANUAL INSTRUCTIONS AND PARTS BREAKDOWN IN CIRCUIT TYPE TRANSISTOR TESTER MODEL SEP 28 1988 1890M HICKOK ELECTRICAL INSTRUMENT COMPANY i 4 AF36 600 13288 F41608 84 D A384 F41608 87 D A28 DISTRIBUTION STATEMENT This publication is required tor official use or tor Administrative or Operational purposes only Distribution is limited to U S Government agencies Other requests for this document shall be referred to San Antonio ALC MMEDT Kelly AFB TX 78241 5000 HANDLING AND DESTRUCT

Hickok 1890M In-circuit transistor tester

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